mb/google/brya/acpi: Turn NV12 enable signal off on GCOFF entry

Properly shutdown NV12 rail in the off sequence (current
implementation leaves it asserted).

BUG=b:286287940
TEST=NV12 now shuts down on GCOFF entry
Change-Id: I7d338fc4a96f119617aff558413a5a9ac44c27d7
Signed-off-by: Tarun Tuli <taruntuli@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75533
Reviewed-by: Eran Mitrani <mitrani@google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
diff --git a/src/mainboard/google/brya/acpi/power.asl b/src/mainboard/google/brya/acpi/power.asl
index c4a8495..5638e18 100644
--- a/src/mainboard/google/brya/acpi/power.asl
+++ b/src/mainboard/google/brya/acpi/power.asl
@@ -312,7 +312,7 @@
 	GPPL (GPIO_1V8_PG, 0, 20)
 
 	/* Ramp down 1.2V rail on boards with support */
-	STXS (GPIO_NV12_PWR_EN)
+	CTXS (GPIO_NV12_PWR_EN)
 	GPPL (GPIO_NV12_PG, 0, 5)
 
 	GCOT = Timer