mb/intel/mtlrvp: Enable EC for mtlrvp

This patch will initialize EC for mtlrvp which includes,
1. Add configuration (& choice) for CHROME_EC and INTEL_EC (WINDOWS_EC)
2. Add respective ACPI configuration
3. Add ec.c required for ramstage
4. Program EC ranges as part of devicetree.cb
5. Enable VBOOT in Kconfig

BUG=b:224325352
TEST=Able to build with the patch and boot the mtlrvp platform with
CHROME_EC using subsequent patches in the train

Signed-off-by: Jamie Ryu <jamie.m.ryu@intel.com>
Change-Id: I662d7f79050d35e152d97dc5c2118a4af56223bc
Signed-off-by: Harsha B R <harsha.b.r@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66101
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Usha P <usha.p@intel.com>
Reviewed-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/intel/mtlrvp/Kconfig

@@ -44,4 +44,27 @@ config OVERRIDE_DEVICETREE
 	string
 	default "variants/\$(CONFIG_VARIANT_DIR)/overridetree.cb"
 
+choice
+	prompt "ON BOARD EC"
+	default MTL_INTEL_EC if BOARD_INTEL_MTLRVP_P
+	default MTL_CHROME_EC if BOARD_INTEL_MTLRVP_P_EXT_EC
+	help
+	  This option allows you to select the on board EC to use.
+	  Select whether the board has Intel EC or/and Chrome EC
+
+config MTL_CHROME_EC
+	bool "Chrome EC"
+	select EC_ACPI
+	select EC_GOOGLE_CHROMEEC
+	select EC_GOOGLE_CHROMEEC_ESPI
+	select EC_GOOGLE_CHROMEEC_BOARDID
+
+config MTL_INTEL_EC
+	bool "Intel EC"
+	select EC_ACPI
+endchoice
+
+config VBOOT
+	select VBOOT_LID_SWITCH
+
 endif # BOARD_INTEL_MTLRVP_COMMON