AMD CIMx sb800/SATA.c, sb900/Sata.c:  Fix R*AI*D typo in comments

Spell RAID correctly in comments. Found with the following command.

    $ git grep -i riad

Change-Id: I68e8476d885a88df589d25f88cc158d71eb04e07
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/3081
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/src/vendorcode/amd/cimx/sb900/Sata.c b/src/vendorcode/amd/cimx/sb900/Sata.c
index 9a7cf53..98e1f57 100644
--- a/src/vendorcode/amd/cimx/sb900/Sata.c
+++ b/src/vendorcode/amd/cimx/sb900/Sata.c
@@ -694,7 +694,7 @@
   }
 
   if (((pConfig->SataClass) != NATIVE_IDE_MODE) && ((pConfig->SataClass) != LEGACY_IDE_MODE)) {
-    // RIAD or AHCI
+    // RAID or AHCI
     if ((pConfig->SATAMODE.SataMode.SataIdeCombinedMode) == DISABLED) {
       // IDE2 Controller is enabled
       if ((pConfig->SATAMODE.SataMode.SataIdeCombMdPriSecOpt) == ENABLED) {