soc/intel/alderlake: Add IOM PCR PID

Required for accessing IOM REGBAR space.

Change-Id: I883acfa6aa41758e3c8636c94fbee920397fce8b
Signed-off-by: Deepti Deshatty <deepti.deshatty@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54086
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

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

@@ -28,6 +28,7 @@
 #define PID_PSF2	0xbb
 #define PID_PSF3	0xbc
 #define PID_PSF4	0xbd
+#define PID_IOM		0xc1
 #define PID_RTC		0xc3
 #define PID_ITSS	0xc4
 #define PID_SERIALIO	0xcb