media: dt-bindings: Add bindings for panasonic,amg88xx

Define the device tree bindings for the panasonic,amg88xx i2c
video driver.

Cc: devicetree@vger.kernel.org
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NMatt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: NHans Verkuil <hansverk@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org>

Documentation/devicetree/bindings/media/i2c/panasonic,amg88xx.txt

+* Panasonic AMG88xx
+
+The Panasonic family of AMG88xx Grid-Eye sensors allow recording
+8x8 10Hz video which consists of thermal datapoints
+
+Required Properties:
+ - compatible : Must be "panasonic,amg88xx"
+ - reg : i2c address of the device
+
+Example:
+
+	i2c0@1c22000 {
+		...
+		amg88xx@69 {
+			compatible = "panasonic,amg88xx";
+			reg = <0x69>;
+		};
+		...
+	};