mb/google/bry: remove GSC option as it's not used

BUG=None
BRANCH=None
TEST=util/abuild/abuild -p none -t google/brya -x -a

Signed-off-by: YH Lin <yueherngl@google.com>
Change-Id: I932178dc395a4a96682a2e2076131feb3342aa52
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55597
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/brya/variants/brya0/overridetree.cb

@@ -7,10 +7,6 @@ fw_config
 		option SD_ABSENT		0
 		option SD_GL9755S		1
 	end
-	field GSC 6 6
-		option H1D			0
-		option H1B			1
-	end
 	field KB_BL 7 7
 		option KB_BL_ABSENT		0
 		option KB_BL_PRESENT		1