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>

src/include/rmodule.h

@@ -69,7 +69,7 @@ struct rmodule {
 	void *relocations;
 };
 
-#if IS_ENABLED(CONFIG_RELOCATABLE_MODULES)
+#if CONFIG(RELOCATABLE_MODULES)
 /* Rmodules have an entry point of named _start. */
 #define RMODULE_ENTRY(entry_) \
 	void _start(void *) __attribute__((alias(STRINGIFY(entry_))))