soc/intel/common: Rename kconfig PMC_EPOC

Rename PMC_EPOC to SOC_INTEL_COMMON_BLOCK_PMC_EPOC to maintain
common naming convention.

Signed-off-by: Lean Sheng Tan <lean.sheng.tan@intel.com>
Change-Id: If8a264007bbb85a44bbdfa72115eb687c32ec36e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55982
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/soc/intel/common/block/pmc/pmclib.c b/src/soc/intel/common/block/pmc/pmclib.c
index 81d25e0..6c756b1 100644
--- a/src/soc/intel/common/block/pmc/pmclib.c
+++ b/src/soc/intel/common/block/pmc/pmclib.c
@@ -729,7 +729,7 @@
 
 enum pch_pmc_xtal pmc_get_xtal_freq(void)
 {
-	if (!CONFIG(PMC_EPOC))
+	if (!CONFIG(SOC_INTEL_COMMON_BLOCK_PMC_EPOC))
 		dead_code();
 
 	uint32_t xtal_freq = 0;