coreboot: Replace all IS_ENABLED(CONFIG_XXX) with CONFIG(XXX)

This patch is a raw application of

 find src/ -type f | xargs sed -i -e 's/IS_ENABLED\s*(CONFIG_/CONFIG(/g'

Change-Id: I6262d6d5c23cabe23c242b4f38d446b74fe16b88
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31774
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/northbridge/intel/sandybridge/raminit_common.c b/src/northbridge/intel/sandybridge/raminit_common.c
index 6bda9ed..fda662f 100644
--- a/src/northbridge/intel/sandybridge/raminit_common.c
+++ b/src/northbridge/intel/sandybridge/raminit_common.c
@@ -390,7 +390,7 @@
 
 	/* If this is zero, it just means devicetree.cb didn't set it */
 	if (!cfg || cfg->max_mem_clock_mhz == 0) {
-		if (IS_ENABLED(CONFIG_NATIVE_RAMINIT_IGNORE_MAX_MEM_FUSES))
+		if (CONFIG(NATIVE_RAMINIT_IGNORE_MAX_MEM_FUSES))
 			return TCK_1333MHZ;
 
 		rev = pci_read_config8(PCI_DEV(0, 0, 0), PCI_DEVICE_ID);