1. Specify addition inputs needed for R8 / D8 / Javac actions so that
they can be successfully executed remotely.
2. Cleanup platform configuration so that pool-names are turned into a
common variable and re-used between javac / r8 / d8 actions.

Bug: b/152273259
Change-Id: I0231a96f6e4e094e98d0f89728f6ac3e34f78118
Merged-In: I0231a96f6e4e094e98d0f89728f6ac3e34f78118