soc/intel/skylake: Make use of common SMM code for SKL

This patch ensures skylake soc is using common SMM code
from intel common block.

TEST=Build and boot soraka/eve

Change-Id: I8163dc7e18bb417e8c18a12628988959c128b3df
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Signed-off-by: Brandon Breitenstein <brandon.breitenstein@intel.com>
Reviewed-on: https://review.coreboot.org/22826
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/skylake/Kconfig

@@ -76,6 +76,8 @@ config CPU_SPECIFIC_OPTIONS
 	select SOC_INTEL_COMMON_BLOCK_SCS
 	select SOC_INTEL_COMMON_BLOCK_SGX
 	select SOC_INTEL_COMMON_BLOCK_SMBUS
+	select SOC_INTEL_COMMON_BLOCK_SMM
+	select SOC_INTEL_COMMON_BLOCK_SMM_IO_TRAP
 	select SOC_INTEL_COMMON_BLOCK_SPI
 	select SOC_INTEL_COMMON_BLOCK_TIMER
 	select SOC_INTEL_COMMON_BLOCK_UART