nb/intel: add IS_ENABLED() around Kconfig symbol references

Some of these can be changed from #if to if(), but that will happen
in a follow-on commmit.

Change-Id: Id5bc8b75b1fa372f31982b8636f1efa4975b61a5
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/20346
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/northbridge/intel/e7505/raminit.c b/src/northbridge/intel/e7505/raminit.c
index 975a373..b38132a 100644
--- a/src/northbridge/intel/e7505/raminit.c
+++ b/src/northbridge/intel/e7505/raminit.c
@@ -41,7 +41,7 @@
 // Unfortunately the code seems to chew up several K of space.
 //#define VALIDATE_DIMM_COMPATIBILITY
 
-#if CONFIG_DEBUG_RAM_SETUP
+#if IS_ENABLED(CONFIG_DEBUG_RAM_SETUP)
 #define RAM_DEBUG_MESSAGE(x)	printk(BIOS_DEBUG, x)
 #define RAM_DEBUG_HEX32(x)	printk(BIOS_DEBUG, "%08x", x)
 #define RAM_DEBUG_HEX8(x)	printk(BIOS_DEBUG, "%02x", x)
@@ -1003,7 +1003,7 @@
 			 ::: "edi"
 		);
 
-#if CONFIG_DEBUG_RAM_SETUP
+#if IS_ENABLED(CONFIG_DEBUG_RAM_SETUP)
 		unsigned int a1, a2;
 		asm volatile("movd %%xmm2, %%eax;" : "=a" (a1) ::);
 		asm volatile("movd %%xmm3, %%eax;" : "=a" (a2) ::);