Update angular-material.d.ts (#8896)
Update angular-material.d.ts (#8896)

Add IColorPalette for [$mdColorPalette](https://github.com/angular/material/blob/master/src/core/services/theming/theme.palette.js)
use-strict/DefinitelyTyped,tan9/DefinitelyTyped,magny/DefinitelyTyped,mcliment/DefinitelyTyped,Zzzen/DefinitelyTyped,magny/DefinitelyTyped,benliddicott/DefinitelyTyped,EnableSoftware/DefinitelyTyped,aciccarello/DefinitelyTyped,abbasmhd/DefinitelyTyped,newclear/DefinitelyTyped,stephenjelfs/DefinitelyTyped,johan-gorter/DefinitelyTyped,laurentiustamate94/DefinitelyTyped,mcrawshaw/DefinitelyTyped,chrootsu/DefinitelyTyped,HPFOD/DefinitelyTyped,Penryn/DefinitelyTyped,alvarorahul/DefinitelyTyped,aciccarello/DefinitelyTyped,mattblang/DefinitelyTyped,yuit/DefinitelyTyped,abbasmhd/DefinitelyTyped,nycdotnet/DefinitelyTyped,abner/DefinitelyTyped,isman-usoh/DefinitelyTyped,smrq/DefinitelyTyped,schmuli/DefinitelyTyped,schmuli/DefinitelyTyped,use-strict/DefinitelyTyped,gandjustas/DefinitelyTyped,alexdresko/DefinitelyTyped,alvarorahul/DefinitelyTyped,jimthedev/DefinitelyTyped,greglo/DefinitelyTyped,benishouga/DefinitelyTyped,emanuelhp/DefinitelyTyped,slavomirvojacek/adbrain-typescript-definitions,hellopao/DefinitelyTyped,nobuoka/DefinitelyTyped,arusakov/DefinitelyTyped,minodisk/DefinitelyTyped,Litee/DefinitelyTyped,EnableSoftware/DefinitelyTyped,DzmitryDulko/DefinitelyTyped,raijinsetsu/DefinitelyTyped,arusakov/DefinitelyTyped,donnut/DefinitelyTyped,mhegazy/DefinitelyTyped,florentpoujol/DefinitelyTyped,daptiv/DefinitelyTyped,aciccarello/DefinitelyTyped,Penryn/DefinitelyTyped,sledorze/DefinitelyTyped,chbrown/DefinitelyTyped,HPFOD/DefinitelyTyped,mareek/DefinitelyTyped,minodisk/DefinitelyTyped,nainslie/DefinitelyTyped,damianog/DefinitelyTyped,gcastre/DefinitelyTyped,amir-arad/DefinitelyTyped,xStrom/DefinitelyTyped,psnider/DefinitelyTyped,martinduparc/DefinitelyTyped,zuzusik/DefinitelyTyped,nycdotnet/DefinitelyTyped,xStrom/DefinitelyTyped,slavomirvojacek/DefinitelyTyped,georgemarshall/DefinitelyTyped,Zzzen/DefinitelyTyped,isman-usoh/DefinitelyTyped,sledorze/DefinitelyTyped,johan-gorter/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,damianog/DefinitelyTyped,DzmitryDulko/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,dsebastien/DefinitelyTyped,amanmahajan7/DefinitelyTyped,paulmorphy/DefinitelyTyped,georgemarshall/DefinitelyTyped,frogcjn/DefinitelyTyped,AgentME/DefinitelyTyped,jraymakers/DefinitelyTyped,one-pieces/DefinitelyTyped,mattblang/DefinitelyTyped,zuzusik/DefinitelyTyped,rolandzwaga/DefinitelyTyped,AgentME/DefinitelyTyped,QuatroCode/DefinitelyTyped,pocesar/DefinitelyTyped,rolandzwaga/DefinitelyTyped,ryan-codingintrigue/DefinitelyTyped,arma-gast/DefinitelyTyped,subash-a/DefinitelyTyped,nfriend/DefinitelyTyped,emanuelhp/DefinitelyTyped,chrootsu/DefinitelyTyped,georgemarshall/DefinitelyTyped,nobuoka/DefinitelyTyped,chrismbarr/DefinitelyTyped,hellopao/DefinitelyTyped,psnider/DefinitelyTyped,raijinsetsu/DefinitelyTyped,borisyankov/DefinitelyTyped,YousefED/DefinitelyTyped,smrq/DefinitelyTyped,jimthedev/DefinitelyTyped,mcrawshaw/DefinitelyTyped,ashwinr/DefinitelyTyped,Litee/DefinitelyTyped,pwelter34/DefinitelyTyped,danfma/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,syuilo/DefinitelyTyped,jraymakers/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,arusakov/DefinitelyTyped,pocesar/DefinitelyTyped,AgentME/DefinitelyTyped,subash-a/DefinitelyTyped,hellopao/DefinitelyTyped,paulmorphy/DefinitelyTyped,arma-gast/DefinitelyTyped,greglo/DefinitelyTyped,QuatroCode/DefinitelyTyped,borisyankov/DefinitelyTyped,abner/DefinitelyTyped,alexdresko/DefinitelyTyped,donnut/DefinitelyTyped,YousefED/DefinitelyTyped,martinduparc/DefinitelyTyped,martinduparc/DefinitelyTyped,axelcostaspena/DefinitelyTyped,slavomirvojacek/adbrain-typescript-definitions,amanmahajan7/DefinitelyTyped,stephenjelfs/DefinitelyTyped,danfma/DefinitelyTyped,nainslie/DefinitelyTyped,scriby/DefinitelyTyped,benishouga/DefinitelyTyped,syuilo/DefinitelyTyped,zuzusik/DefinitelyTyped,schmuli/DefinitelyTyped,mhegazy/DefinitelyTyped,progre/DefinitelyTyped,musicist288/DefinitelyTyped,progre/DefinitelyTyped,Ptival/DefinitelyTyped,pocesar/DefinitelyTyped,scriby/DefinitelyTyped,shlomiassaf/DefinitelyTyped,pwelter34/DefinitelyTyped,yuit/DefinitelyTyped,AgentME/DefinitelyTyped,jimthedev/DefinitelyTyped,reppners/DefinitelyTyped,florentpoujol/DefinitelyTyped,ashwinr/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,Ptival/DefinitelyTyped,rcchen/DefinitelyTyped,psnider/DefinitelyTyped,slavomirvojacek/DefinitelyTyped,frogcjn/DefinitelyTyped,micurs/DefinitelyTyped,chrismbarr/DefinitelyTyped,benishouga/DefinitelyTyped,gandjustas/DefinitelyTyped,dsebastien/DefinitelyTyped,tan9/DefinitelyTyped,georgemarshall/DefinitelyTyped,gcastre/DefinitelyTyped,mareek/DefinitelyTyped,shlomiassaf/DefinitelyTyped,newclear/DefinitelyTyped,rcchen/DefinitelyTyped,markogresak/DefinitelyTyped,reppners/DefinitelyTyped