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/sb800/SATA.c b/src/vendorcode/amd/cimx/sb800/SATA.c
index b7bbacd..4aa3be7 100644
--- a/src/vendorcode/amd/cimx/sb800/SATA.c
+++ b/src/vendorcode/amd/cimx/sb800/SATA.c
@@ -469,7 +469,7 @@
   RWPCI (((SATA_BUS_DEV_FUN << 16) + SB_SATA_REG34), AccWidthUint8 | S3_SAVE, 0, 0x70);
 
   if (((pConfig->SataClass) != NATIVE_IDE_MODE) && ((pConfig->SataClass) != LEGACY_IDE_MODE)) {
-    // RIAD or AHCI
+    // RAID or AHCI
     if ((pConfig->SATAMODE.SataMode.SataIdeCombinedMode) == SATA_IDE_COMBINE_DISABLE) {
       RWMEM ((ddBar5 + SB_SATA_BAR5_REG00), AccWidthUint8 | S3_SAVE, ~(BIT2 + BIT1 + BIT0), BIT2 + BIT0);
       RWMEM ((ddBar5 + SB_SATA_BAR5_REG0C), AccWidthUint8 | S3_SAVE, 0xC0, 0x3F);