mb/google/drallion: Enable cbfs SAR value

Enable read SAR value from cbfs.

BUG=b:150347463
TEST=NA

Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: I5f27b6f7245669728e3e394e9c6a39c11bfda3b8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39194
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Ivy Jian <ivy_jian@compal.corp-partner.google.com>

src/mainboard/google/drallion/Kconfig

@@ -22,9 +22,6 @@ config BOARD_GOOGLE_BASEBOARD_DRALLION
 	select SYSTEM_TYPE_LAPTOP
 	select TPM2
 	select MAINBOARD_USES_IFD_EC_REGION
-	select USE_SAR
-	select SAR_ENABLE
-	select DSAR_ENABLE
 
 if BOARD_GOOGLE_BASEBOARD_DRALLION
 
@@ -36,6 +33,14 @@ config CHROMEOS
 	select GBB_FLAG_FORCE_DEV_BOOT_LEGACY
 	select GBB_FLAG_DISABLE_EC_SOFTWARE_SYNC
 
+config CHROMEOS_WIFI_SAR
+	bool "Enable SAR options for Chrome OS build"
+	depends on CHROMEOS
+	select DSAR_ENABLE
+	select SAR_ENABLE
+	select USE_SAR
+	select WIFI_SAR_CBFS
+
 config DIMM_MAX
 	int
 	default 2