mb/google/guybrush,mancomb: use EC_SCI_GPI in espi_sci_sources struct

The board's ec.h file defined EC_SCI_GPI as GEVENT_24, so use that
definition in all places in the mainboard code instead of a mix of the
board specific define and the SoC's GEVENT number define.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I46525ed24e9993acd3d850959dd63761a690d5df
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52309
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/mainboard/google/guybrush/ec.c

@@ -10,7 +10,7 @@
 static const struct sci_source espi_sci_sources[] = {
 	{
 		.scimap = SMITYPE_ESPI_SYS,
-		.gpe = GEVENT_24,
+		.gpe = EC_SCI_GPI,
 		.direction = SMI_SCI_LVL,
 		.level = SMI_SCI_LVL_HIGH
 	}

src/mainboard/google/mancomb/ec.c

@@ -10,7 +10,7 @@
 static const struct sci_source espi_sci_sources[] = {
 	{
 		.scimap = SMITYPE_ESPI_SYS,
-		.gpe = GEVENT_24,
+		.gpe = EC_SCI_GPI,
 		.direction = SMI_SCI_LVL,
 		.level = SMI_SCI_LVL_HIGH
 	}