soc/intel/alderlake: Select VBOOT_X86_SHA256_ACCELERATION config

By enabling the flag alderlake platform will use hardware sha
instruction instead of software implementation for sha256.

This will speed up firmware verification especially on low-performance
device.

Change-Id: Ie8ab02360fdceafab257e9a301e6a89d3a22c3ae
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55612
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/soc/intel/alderlake/Kconfig

@@ -255,6 +255,7 @@ config VBOOT
 	select VBOOT_STARTS_IN_BOOTBLOCK
 	select VBOOT_VBNV_CMOS
 	select VBOOT_VBNV_CMOS_BACKUP_TO_FLASH
+	select VBOOT_X86_SHA256_ACCELERATION
 
 config CBFS_SIZE
 	hex