soc/intel/icelake: Fix chipset_power_state structure

This patch ports CB:30717 changes from CNL to ICL.

This structure is declared as a static CAR_GLOBAL in the common
PMC library code and in the SOC specific code.  Remove the SOC
specific version and instead get the chipset_power_state pointer
from the PMC library.

This fixes events that were recorded in chipset_power_state at
boot but were reading as all zero when it was time to parse the
structure when logging events to flash.

Change-Id: I1152d0e882e1acf475072d1553b74f9161e2f485
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32095
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/icelake/romstage/romstage.c

@@ -31,8 +31,6 @@
 #include <string.h>
 #include <timestamp.h>
 
-static struct chipset_power_state power_state;
-
 #define FSP_SMBIOS_MEMORY_INFO_GUID	\
 {	\
 	0xd4, 0x71, 0x20, 0x9b, 0x54, 0xb0, 0x0c, 0x4e,	\
@@ -111,7 +109,7 @@ asmlinkage void car_stage_entry(void)
 	bool s3wake;
 	struct postcar_frame pcf;
 	uintptr_t top_of_ram;
-	struct chipset_power_state *ps = &power_state;
+	struct chipset_power_state *ps = pmc_get_power_state();
 
 	console_init();