Add pl111 as a KMS driver for utils.

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Daniel Stone <daniels@collabora.com>
diff --git a/tests/util/kms.c b/tests/util/kms.c
index 959b688..c008f78 100644
--- a/tests/util/kms.c
+++ b/tests/util/kms.c
@@ -145,6 +145,7 @@
 	"virtio_gpu",
 	"mediatek",
 	"meson",
+	"pl111",
 };
 
 int util_open(const char *device, const char *module)