arm64: boot: dts: qcom: surface duo: add minimal framebuffer

Add a minimal framebuffer device so we can use the display on the
Surface Duo device.

Signed-off-by: Felipe Balbi <felipe.balbi@microsoft.com>
diff --git a/arch/arm64/boot/dts/qcom/sm8150-microsoft-surface-duo.dts b/arch/arm64/boot/dts/qcom/sm8150-microsoft-surface-duo.dts
index a73317e1..c629ec1 100644
--- a/arch/arm64/boot/dts/qcom/sm8150-microsoft-surface-duo.dts
+++ b/arch/arm64/boot/dts/qcom/sm8150-microsoft-surface-duo.dts
@@ -25,6 +25,17 @@
 		stdout-path = "serial0:115200n8";
 	};
 
+	framebuffer0: framebuffer@9c000000 {
+		compatible = "simple-framebuffer";
+		reg = <0 0x9c000000 0 0x02400000>;
+		status = "okay";
+
+		height = <1800>;
+		width = <1350>;
+		stride = <(1350 * 4)>;
+		format = "a8r8g8b8";
+	};
+
 	vph_pwr: vph-pwr-regulator {
 		compatible = "regulator-fixed";
 		regulator-name = "vph_pwr";
@@ -472,6 +483,14 @@
 	linux,code = <KEY_VOLUMEDOWN>;
 };
 
+&reserved_memory {
+	splash_region: splash_region@9c000000 {
+		/* We expect the bootloader to fill in the size */
+		reg = <0x0 0x9c000000 0x0 0x0>;
+		no-map;
+	};
+};
+
 &tlmm {
 	gpio-reserved-ranges = <126 4>;