soc/intel/common/mmc: Replace IS_ENABLED() with CONFIG()

Change-Id: I99d51176f6d7d6a98a3a3c82aa8e8eee73344496
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33111
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/common/block/include/intelblocks/early_mmc.h

@@ -61,7 +61,7 @@ int soc_configure_mmc_gpios(void);
  */
 int soc_get_mmc_dll(struct mmc_dll_params *params);
 
-#if IS_ENABLED(CONFIG_SOC_INTEL_COMMON_EARLY_MMC_WAKE)
+#if CONFIG(SOC_INTEL_COMMON_EARLY_MMC_WAKE)
 /*
  * Initializes sdhci / mmc controller and sends CMD0, CMD1 to emmc card.
  * In case of success: It returns 0 and adds cbmem entry CBMEM_ID_MMC_STATUS