soc/intel/alderlake: Send End-of-Post message to CSE

This is done to ensure the CSE will not execute any pre-boot commands
after it receives this command. Verified EOP and error recovery sequence
from Intel doc#627331.

TEST=on brya, autotest firmware_CheckEOPState confirms ME is in
post-boot state

Change-Id: Iee8c29f81d5d04852ae3f16dc8a9ff0fa59f056a
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55596
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/alderlake/Kconfig

@@ -75,6 +75,7 @@ config CPU_SPECIFIC_OPTIONS
 	select SOC_INTEL_COMMON_FSP_RESET
 	select SOC_INTEL_COMMON_PCH_BASE
 	select SOC_INTEL_COMMON_RESET
+	select SOC_INTEL_CSE_SET_EOP
 	select SSE2
 	select SUPPORT_CPU_UCODE_IN_CBFS
 	select TSC_MONOTONIC_TIMER