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/drivers/nvram.c

@@ -60,7 +60,7 @@
  * doesn't try to do this on its own.
  */
 #define RTC_PORT_STANDARD      0x70
-#if IS_ENABLED(CONFIG_LP_RTC_PORT_EXTENDED_VIA)
+#if CONFIG(LP_RTC_PORT_EXTENDED_VIA)
 #define RTC_PORT_EXTENDED      0x74
 #else
 #define RTC_PORT_EXTENDED      0x72