Move keystore to Android.bp.

Test: builds, boots
Bug: 67041047
Change-Id: I4ec9ddc69552d853e7d1c2296dcd8de8cb3f5942
Merged-In: I4ec9ddc69552d853e7d1c2296dcd8de8cb3f5942
(cherry picked from commit c493cf958675eb934f5e67c43201d4f756469443)
7 files changed