mb/**/gma-mainboard.ads: Use lowercase for `others`

These two files are the only places where the `others` keyword is
capitalised. Use lowercase for consistency with the rest of the tree.

Change-Id: I6b785e28d1d00a11b802a44348a7132ceb6b599d
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57399
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/51nb/x210/gma-mainboard.ads

@@ -12,6 +12,6 @@ private package GMA.Mainboard is
      (DP1,
       DP2,
       eDP,
-      Others => Disabled);
+      others => Disabled);
 
 end GMA.Mainboard;

src/mainboard/asus/p8x7x-series/variants/p8z77-v_lx2/gma-mainboard.ads

@@ -11,6 +11,6 @@ private package GMA.Mainboard is
    ports : constant Port_List :=
      (HDMI3,
       Analog,
-      Others => Disabled);
+      others => Disabled);
 
 end GMA.Mainboard;