dt-bindings: Add binding for Samsung S6E63J0X03 panel

The Samsung S6E63J0X03 is a 1.63" 320x320 AMOLED panel connected using
MIPI-DSI interfaces.
Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1499912443-3671-2-git-send-email-hoegeun.kwon@samsung.com

Documentation/devicetree/bindings/display/panel/samsung,s6e63j0x03.txt

+Samsung S6E63J0X03 1.63" 320x320 AMOLED panel (interface: MIPI-DSI command mode)
+
+Required properties:
+  - compatible: "samsung,s6e63j0x03"
+  - reg: the virtual channel number of a DSI peripheral
+  - vdd3-supply: I/O voltage supply
+  - vci-supply: voltage supply for analog circuits
+  - reset-gpios: a GPIO spec for the reset pin (active low)
+  - te-gpios: a GPIO spec for the tearing effect synchronization signal
+    gpio pin (active high)
+
+Example:
+&dsi {
+	...
+
+	panel@0 {
+		compatible = "samsung,s6e63j0x03";
+		reg = <0>;
+		vdd3-supply = <&ldo16_reg>;
+		vci-supply = <&ldo20_reg>;
+		reset-gpios = <&gpe0 1 GPIO_ACTIVE_LOW>;
+		te-gpios = <&gpx0 6 GPIO_ACTIVE_HIGH>;
+	};
+};