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/cpu/x86/16bit/entry16.inc b/src/cpu/x86/16bit/entry16.inc
index 2a9f8c5..9e00c55 100644
--- a/src/cpu/x86/16bit/entry16.inc
+++ b/src/cpu/x86/16bit/entry16.inc
@@ -29,8 +29,8 @@
 
 #include <arch/rom_segs.h>
 
-#if IS_ENABLED(CONFIG_C_ENVIRONMENT_BOOTBLOCK) || \
-    IS_ENABLED(CONFIG_SIPI_VECTOR_IN_ROM)
+#if CONFIG(C_ENVIRONMENT_BOOTBLOCK) || \
+    CONFIG(SIPI_VECTOR_IN_ROM)
 /* Symbol _start16bit must be aligned to 4kB to start AP CPUs with
  * Startup IPI message without RAM.
  */
@@ -44,7 +44,7 @@
 	cli
 	/* Save the BIST result */
 	movl	%eax, %ebp
-#if !IS_ENABLED(CONFIG_NO_EARLY_BOOTBLOCK_POSTCODES)
+#if !CONFIG(NO_EARLY_BOOTBLOCK_POSTCODES)
 	post_code(POST_RESET_VECTOR_CORRECT)
 #endif