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

This patch is a raw application of

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

Change-Id: I883b03b189f59b5d998a09a2596b0391a2d5cf33
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31775
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

payloads/libpayload/libc/64bit_div.c

@@ -30,7 +30,7 @@
 #include <libpayload-config.h>
 #include <stdlib.h>
 
-#if !IS_ENABLED(CONFIG_LP_LITTLE_ENDIAN)
+#if !CONFIG(LP_LITTLE_ENDIAN)
 #error this code is for little endian only
 #endif