am a19801e: am c521e26: AI 148186: Add support for using custom pdk temp

Merge commit 'a19801e0600b9016149f56cff05da5a699bf09cc'

* commit 'a19801e0600b9016149f56cff05da5a699bf09cc':
  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