AI 148186: Add support for using custom pdk templates. The make rule for pdk docs should set LOCAL_DROIDDOC_OPTIONS += -hdf android.whichdoc online-pdk   BUG=1646802
AI 148186: Add support for using custom pdk templates. The make rule for pdk docs should set LOCAL_DROIDDOC_OPTIONS += -hdf android.whichdoc online-pdk
  BUG=1646802

Automated import of CL 148186

hagar006/platform_manifest,see4ri/lolili,ND-3500/platform_manifest,RR-msm7x30/platform_manifest,pranav01/platform_manifest,knone1/platform_manifest,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,fallouttester/platform_manifest,Hybrid-Power/startsync