soc/intel/common/pmc: Drop unnecessary pmc_ipc.c entry

This patch drops unnecessary `pmc_ipc.c` from Makefile as this
file is getting included upon CONFIG_PMC_IPC_ACPI_INTERFACE selection.

Change-Id: Ie66f0833daf033ec16210221610508f9fbb1e6c7
Signed-off-by: Subrata Banik <subi.banik@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59747
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/Makefile.inc b/src/soc/intel/common/block/pmc/Makefile.inc
index de69b63..8dacc10 100644
--- a/src/soc/intel/common/block/pmc/Makefile.inc
+++ b/src/soc/intel/common/block/pmc/Makefile.inc
@@ -2,7 +2,7 @@
 bootblock-y += pmclib.c
 romstage-y += pmclib.c
 ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_PMC_DISCOVERABLE) += pmc.c
-ramstage-y += pmclib.c pmc_ipc.c
+ramstage-y += pmclib.c
 smm-y += pmclib.c
 verstage-y += pmclib.c
 postcar-y += pmclib.c