src: capitalize 'RAM'

Change-Id: Ia05cb2de1b9f2a36fc9ecc22fb82f0c14da00a76
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39029
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/northbridge/intel/x4x/memmap.c b/src/northbridge/intel/x4x/memmap.c
index 1924ddf..334e6c7 100644
--- a/src/northbridge/intel/x4x/memmap.c
+++ b/src/northbridge/intel/x4x/memmap.c
@@ -144,8 +144,8 @@
 {
 	uintptr_t top_of_ram;
 
-	/* Cache 8 MiB region below the top of ram and 2 MiB above top of
-	 * ram to cover both cbmem as the TSEG region.
+	/* Cache 8 MiB region below the top of RAM and 2 MiB above top of
+	 * RAM to cover both cbmem as the TSEG region.
 	 */
 	top_of_ram = (uintptr_t)cbmem_top();
 	postcar_frame_add_mtrr(pcf, top_of_ram - 8*MiB, 8*MiB,