Refactor keymaster Android.bp

This CL just cleans up the Android.bp a little, mostly by using a
cc_defaults target to consolidate common build options.  More cleanup
is needed, but will have to come later.

Test: Build
Change-Id: I09cfc5291e9616b0509b0cf130519cc8597ccb41
Merged-In: I09cfc5291e9616b0509b0cf130519cc8597ccb41
1 file changed