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/exec.c

@@ -30,7 +30,7 @@
 #include <libpayload-config.h>
 #include <libpayload.h>
 
-#if IS_ENABLED(CONFIG_LP_ARCH_X86)
+#if CONFIG(LP_ARCH_X86)
 extern void i386_do_exec(long addr, int argc, char **argv, int *ret);
 #endif
 
@@ -46,7 +46,7 @@ int exec(long addr, int argc, char **argv)
 {
 	int val = -1;
 
-#if IS_ENABLED(CONFIG_LP_ARCH_X86)
+#if CONFIG(LP_ARCH_X86)
 	i386_do_exec(addr, argc, argv, &val);
 #endif
 	return val;