Move sdk staging dir to a product-specific dir. DO NOT MERGE.
Move sdk staging dir to a product-specific dir. DO NOT MERGE.

So we can do incremental build across different SDK products.

(cherry picked from commit d7af17619983c4cf679abb034469098235e63ad5)

Change-Id: I7fc1489c00511b6689d738ee12f0347618c03aa3

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build