Correct some GSI settings to board makefile

Some setting currently in target/product/treble_common.mk, but
they should be board config variables. So, move them to
target/board/treble_common.mk.

Bug: 70951849
Test: Build pass and check on a Pixel device with GSI
Change-Id: I511fbc481583555182dab76503e67c5f56efa8eb