mb/google/rex: Enable building for Chrome OS

Enable building for Chrome OS and add associated ACPI configuration.

BUG=b:224325352
TEST=util/abuild/abuild -p none -t google/rex -a -c max

Signed-off-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Change-Id: I75cb2d30d699166a056ed9d3c0779816b733b0d2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64621
Reviewed-by: Tarun Tuli <taruntuli@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/rex/Kconfig b/src/mainboard/google/rex/Kconfig
index dbccce6..3ce79cb 100644
--- a/src/mainboard/google/rex/Kconfig
+++ b/src/mainboard/google/rex/Kconfig
@@ -9,6 +9,7 @@
 	select BOARD_GOOGLE_REX_COMMON
 	select EC_GOOGLE_CHROMEEC
 	select EC_GOOGLE_CHROMEEC_ESPI
+	select MAINBOARD_HAS_CHROMEOS
 	select SOC_INTEL_METEORLAKE
 	select SYSTEM_TYPE_LAPTOP
 
@@ -22,6 +23,7 @@
 	default "rex" if BOARD_GOOGLE_BASEBOARD_REX
 
 config CHROMEOS
+	select EC_GOOGLE_CHROMEEC_SWITCHES
 	select GBB_FLAG_DISABLE_EC_SOFTWARE_SYNC
 	select VBOOT_LID_SWITCH