arm: dts: meson-khadas-vim3: enable SPI NOR flash

Enable the SPI flash controller and reduce the usable eMMC data pins to 4
to permit using the on-board SPI NOR Flash.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/arch/arm/dts/meson-g12b-a311d-khadas-vim3-u-boot.dtsi b/arch/arm/dts/meson-g12b-a311d-khadas-vim3-u-boot.dtsi
new file mode 100644
index 0000000..f66eca1
--- /dev/null
+++ b/arch/arm/dts/meson-g12b-a311d-khadas-vim3-u-boot.dtsi
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2020 BayLibre, SAS
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ */
+
+#include "meson-khadas-vim3-u-boot.dtsi"