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/commonlib/cbfs.c

@@ -27,7 +27,7 @@
 #endif
 #if defined(IS_ENABLED)
 
-#if IS_ENABLED(CONFIG_DEBUG_CBFS)
+#if CONFIG(DEBUG_CBFS)
 #define DEBUG(x...) printk(BIOS_SPEW, "CBFS: " x)
 #else
 #define DEBUG(x...)