mb/google/brya: add BASEBOARD_DIR to support different baseboard

In order to support different baseboard configuration, we
add the BASEBOARD_DIR to switch the directory. The expected
structure looks like:

mb
..|_ google
.........|_ brya
.............. |_ variants
.....................|_ baseboard
..............................|_ brya
....................................|_ gpio.c
....................................|_ memory.c
....................................|_ devicetree
..............................|_ brask
....................................|_ gpio.c
....................................|_ memory.c
....................................|_ devicetree
......................|_ brya_variant1
......................|_ brya_variant2
......................|_ ...
......................|_ brask_variant1
......................|_ brask_variant2
......................|_ ...
...............|_ <all mb common code>

BUG=b:191472401
BRANCH=None
TEST=build pass

Change-Id: Ic99e42dbbd27fa3e1f6cb3a1b5daee1c8c7b1083
Signed-off-by: Zhuohao Lee <zhuohao@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56308
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>

0 files changed, 0 insertions, 0 deletions