soc/intel/ehl: Select CSE defined ME spec version for elkhartlake

Elkhartlake based SoCs uses Intel's Management Engine (ME), version 15.
This patch selects ME 15 specification defined at common code and
removes elkhartlake SoC specific ME code and data structures.

BUG=b:260309647

Signed-off-by: Dinesh Gehlot <digehlot@google.com>
Change-Id: I3186f509c63b3a892c72cb1fa08fc094735d6eeb
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73245
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
diff --git a/src/soc/intel/elkhartlake/Kconfig b/src/soc/intel/elkhartlake/Kconfig
index 8e3dc11..8980bcc 100644
--- a/src/soc/intel/elkhartlake/Kconfig
+++ b/src/soc/intel/elkhartlake/Kconfig
@@ -50,6 +50,7 @@
 	select SOC_INTEL_COMMON_BLOCK_HDA
 	select HAVE_INTEL_FSP_REPO
 	select HECI_DISABLE_USING_SMM if DISABLE_HECI1_AT_PRE_BOOT
+	select SOC_INTEL_COMMON_BLOCK_ME_SPEC_15
 	select SOC_INTEL_COMMON_BLOCK_PMC_EPOC
 	select SOC_INTEL_COMMON_BLOCK_POWER_LIMIT
 	select SOC_INTEL_COMMON_BLOCK_SA