soc/intel/alderlake: Add UFS PCR ID

Add UFS PID (`PID_UFSX2`) value 0x50.

BUG=none
TEST=Able to build and boot Google/Rex.

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I229469475cd116bf911b6530c3c819d00c808aa9
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68298
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Meera Ravindranath <meera.ravindranath@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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

@@ -43,4 +43,6 @@
 #define PID_CPU_GPIOCOM4	0xb9
 #define PID_CPU_GPIOCOM5	0xba
 
+#define PID_UFSX2	0x50
+
 #endif