Move device-specific vars from mainline common

Move a couple of variables out of BoardConfigMainlineCommon
because they vary either by device or by how they build in
AOSP vs internal.

Bug: 80410283
Test: presubmit
Change-Id: Ia42df91ad8c8d8fc4618be375a17ea23896f4352
Merged-In: Ia42df91ad8c8d8fc4618be375a17ea23896f4352