soc/intel/{common,skylake}: provide common NHLT SoC support

The nhlt_soc_serialize() and nhlt_soc_serialize_oem_overrides()
functions should be able to be leveraged on all Intel SoCs
which support NHLT. Therefore provide that functionality and
make skylake use it.

Change-Id: Ib5535cc874f2680ec22554cecaf97b09753cacd0
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/15490
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins)

src/soc/intel/common/Kconfig

@@ -99,4 +99,8 @@ config SOC_INTEL_COMMON_ACPI
 	bool
 	default n
 
+config SOC_INTEL_COMMON_NHLT
+	bool
+	default n
+
 endif # SOC_INTEL_COMMON