mb/google/rex: Enable CSE Lite SKU

The first CSE Lite SKU is available, therefore enable the Kconfig
option to have the CSE reboot the system into its RW FW during a cold
boot.

BUG=b:240228892
TEST=TBD

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I00ef4176cf08cbeed06e446cfe68f06cb1ea27b4
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66287
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/rex/Kconfig

@@ -7,6 +7,7 @@ config BOARD_GOOGLE_REX_COMMON
 	select I2C_TPM
 	select INTEL_LPSS_UART_FOR_CONSOLE
 	select MAINBOARD_HAS_TPM2
+	select SOC_INTEL_CSE_LITE_SKU
 
 config BOARD_GOOGLE_BASEBOARD_REX
 	def_bool n