drm/kmb: Fix for build errors with Warray-bounds

This fixes the following build error

drivers/gpu/drm/kmb/kmb_plane.c: In function 'kmb_plane_atomic_disable':
drivers/gpu/drm/kmb/kmb_plane.c:165:34: error: array subscript 3 is above array bounds of 'struct layer_status[2]' [-Werror=array-bounds]
165 | kmb->plane_status[plane_id].ctrl =
LCD_CTRL_GL2_ENABLE;
| ~~~~~~~~~~~~~~~~~^~~~~~~~~~
In file included from drivers/gpu/drm/kmb/kmb_plane.c:17:
drivers/gpu/drm/kmb/kmb_drv.h:61:41: note: while referencing 'plane_status'
61 | struct layer_status plane_status[KMB_MAX_PLANES];
| ^~~~~~~~~~~~
drivers/gpu/drm/kmb/kmb_plane.c:162:34: error: array subscript 2 is above array bounds of 'struct layer_status[2]' [-Werror=array-bounds]
162 | kmb->plane_status[plane_id].ctrl = LCD_CTRL_GL1_ENABLE;
| ~~~~~~~~~~~~~~~~~^~~~~~~~~~
In file included from
drivers/gpu/drm/kmb/kmb_plane.c:17:
drivers/gpu/drm/kmb/kmb_drv.h:61:41: note: while referencing 'plane_status'
61 | struct layer_status plane_status[KMB_MAX_PLANES];
|
^~~~~~~~~~~~

Fixes: 7f7b96a8a0a1 ("drm/kmb: Add support for KeemBay Display")
Signed-off-by: Anitha Chrisanthus <[e-mail]>
Reviewed-by: Kees Cook <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/kmb/kmb_plane.c

···
 	case LAYER_1:
 		kmb->plane_status[plane_id].ctrl = LCD_CTRL_VL2_ENABLE;
 		break;
-	case LAYER_2:
-		kmb->plane_status[plane_id].ctrl = LCD_CTRL_GL1_ENABLE;
-		break;
-	case LAYER_3:
-		kmb->plane_status[plane_id].ctrl = LCD_CTRL_GL2_ENABLE;
-		break;
 	}
 
 	kmb->plane_status[plane_id].disable = true;