soc/intel/(apl,skl,cnl,common): Move mkhi_hdr structure definition to common

Removed mkhi_hdr structure definition from multiple SOCs, and moved to common.

TEST=Built code for Hatch, apollolake boards.

Change-Id: Ifeba0ed4d98975049179d1b47fb22c06a927dc29
Signed-off-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35545
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/skylake/me.c

@@ -200,14 +200,6 @@ static const char *const me_progress_bup_values[] = {
 
 static void print_me_version(void *unused)
 {
-	struct mkhi_hdr {
-		uint8_t group_id;
-		uint8_t command:7;
-		uint8_t is_resp:1;
-		uint8_t rsvd;
-		uint8_t result;
-	} __packed;
-
 	struct version {
 		uint16_t minor;
 		uint16_t major;