Move PRODUCT_* variable from BoardConfig to product makefile

The PRODUCT_* variables are becoming readonly in BoardConfig.mk files.

Bug: 68153540
Test: lunch arm_v7_v8; get_build_var PRODUCT_ART_TARGET_INCLUDE_DEBUG_BUILD
Change-Id: I9ea7a27bbb5b73ca11f66a8b6f4982320500db7d
2 files changed