mb/google/rex: include Elan HID over SPI ASL for Rex4ES

Existing code did not include the HID over SPI for rex4es.
This CL corrects this issue.

BUG=None
TEST=Tested on Rex

Signed-off-by: Eran Mitrani <mitrani@google.com>
Change-Id: I02f7c4b68cfee2ebb202581c9f031af99ab4b6f9
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77245
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/rex/dsdt.asl

@@ -38,7 +38,7 @@ DefinitionBlock(
 		#include <ec/google/chromeec/acpi/ec.asl>
 	}
 	/* Mainboard specific */
-#if CONFIG(BOARD_GOOGLE_REX0)
+#if CONFIG(BOARD_GOOGLE_MODEL_REX)
 	Scope (\_SB.PCI0.SPI0)
 	{
 		#include <variant/acpi/hid_spi_elan.asl>