Remove FVP specific comments in platform.h
Remove FVP specific comments in platform.h

Remove the FVP specific comments in platform.h since this file
is re-usable across all platforms.

Change-Id: Ifd4a4f72562adb3ecf8b9078b0150f170ef22dba

lsigithub/arm-trusted-firmware_public,yatharth-arm/arm-trusted-firmware,Leo-Yan/arm-trusted-firmware,longsleep/arm-trusted-firmware-pine64,jforissier/arm-trusted-firmware,jcastillo-arm/arm-trusted-firmware,athoelke/arm-trusted-firmware,davwan01/arm-trusted-firmware,robixnai/arm-trusted-firmware,jcastillo-arm/arm-trusted-firmware,idl3r/arm-trusted-firmware,Leo-Yan/arm-trusted-firmware,lsigithub/arm-trusted-firmware_public,ljerry/arm-trusted-firmware,sandrine-bailleux-arm/arm-trusted-firmware,ljerry/arm-trusted-firmware,davwan01/arm-trusted-firmware,jforissier/arm-trusted-firmware,vchong/arm-trusted-firmware,sandrine-bailleux-arm/arm-trusted-firmware,sbranden/arm-trusted-firmware,longsleep/arm-trusted-firmware-pine64,vchong/arm-trusted-firmware,sbranden/arm-trusted-firmware,hzhuang1/arm-trusted-firmware,achingupta/arm-trusted-firmware,sandrine-bailleux/arm-trusted-firmware,mtk09422/arm-trusted-firmware,sandrine-bailleux/arm-trusted-firmware,mtk09422/arm-trusted-firmware,yatharth-arm/arm-trusted-firmware,achingupta/arm-trusted-firmware,robixnai/arm-trusted-firmware,96boards/arm-trusted-firmware,hzhuang1/arm-trusted-firmware,96boards/arm-trusted-firmware,idl3r/arm-trusted-firmware,athoelke/arm-trusted-firmware