Correct SPL use of VIDEO_BPP32

This converts 1 usage of this option to the non-SPL form, since there is
no SPL_VIDEO_BPP32 defined in Kconfig

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/video-uclass.c b/drivers/video/video-uclass.c
index f36970e..6aaacff 100644
--- a/drivers/video/video-uclass.c
+++ b/drivers/video/video-uclass.c
@@ -203,7 +203,7 @@
 		}
 		break;
 	case VIDEO_BPP32:
-		if (CONFIG_IS_ENABLED(VIDEO_BPP32)) {
+		if (IS_ENABLED(CONFIG_VIDEO_BPP32)) {
 			if (priv->format == VIDEO_X2R10G10B10)
 				return (colours[idx].r << 22) |
 				       (colours[idx].g << 12) |