soc/intel/cannonlake: Add emmc/sdc port id

EMMC and SD Controller port id listed here, the port id definition came
from Cannonlake BIOS Writer Guide 570374.

BUG=None
TEST=None

Change-Id: I901e90c47b08bb013fcfee5def610e320a7ac19a
Signed-off-by: Lijian Zhao <lijian.zhao@intel.com>
Reviewed-on: https://review.coreboot.org/23789
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>

src/soc/intel/cannonlake/include/soc/pcr_ids.h

@@ -18,6 +18,8 @@
 /*
  * Port ids
  */
+#define PID_EMMC	0x52
+#define PID_SDX		0x53
 #define PID_GPIOCOM4	0x6a
 #define PID_GPIOCOM3	0x6b
 #define PID_GPIOCOM2	0x6c