Change #ifdef and #if defined CONFIG_ bools to #if IS_ENABLED()

Kconfigs symbols of type bool are always defined, and can be tested with
the IS_ENABLED() macro.

symbol type except string.

Change-Id: Ic4ba79f519ee2a53d39c10859bbfa9c32015b19d
Signed-off-by: Martin Roth <gaumless@gmail.com>
Reviewed-on: http://review.coreboot.org/10885
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/include/device/dram/ddr3.h b/src/include/device/dram/ddr3.h
index 295ea25..7f969b3 100644
--- a/src/include/device/dram/ddr3.h
+++ b/src/include/device/dram/ddr3.h
@@ -55,7 +55,7 @@
  * disabled.
  * @{
  */
-#if defined(CONFIG_DEBUG_RAM_SETUP) && (CONFIG_DEBUG_RAM_SETUP)
+#if IS_ENABLED(CONFIG_DEBUG_RAM_SETUP)
 #define printram(x, ...) printk(BIOS_DEBUG, x, ##__VA_ARGS__)
 #else
 #define printram(x, ...)