mb/google/brya: Update GPIO_PCH_WP configuration in trulo baseboard

Change GPIO_PCH_WP from GPP_E3 to GPP_E12 to align with trulo
reference hardware schematic.

BUG=b:443677716, b:435612546
TEST=Build pujjolo and kaladin firmware and verify SPI ROM
     write-protect

Change-Id: I935d74cb5447f45f297fe45506c14623095d7127
Signed-off-by: Derek Huang <derekhuang@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/89117
Reviewed-by: Eric Lai <ericllai@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/brya/variants/baseboard/trulo/include/baseboard/gpio.h

@@ -11,7 +11,7 @@
 /* EC wake is EC_SOC_WAKE_ODL which is routed to GPP_F17 */
 #define GPE_EC_WAKE		GPE0_DW2_17
 /* WP signal to PCH */
-#define GPIO_PCH_WP		GPP_E3
+#define GPIO_PCH_WP		GPP_E12
 /* EC in RW or RO */
 #define GPIO_EC_IN_RW		GPP_F18
 /* GPIO IRQ for tight timestamps, MKBP interrupts */