dt-bindings: watchdog: Add ARM SP805 DT bindings

The ARM SP805 DT node is already present in various DTS files.
This patch adds missing DT bindings documentation for ARM SP805.
Signed-off-by: NAnup Patel <anup.patel@broadcom.com>
Reviewed-by: NRay Jui <rjui@broadcom.com>
Reviewed-by: NVikram Prakash <vikramp@broadcom.com>
Reviewed-by: NScott Branden <sbranden@broadcom.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>

Documentation/devicetree/bindings/watchdog/arm,sp805.txt

+ARM AMBA Primecell SP805 Watchdog
+
+Required properties:
+- compatible: Should be "arm,sp805" & "arm,primecell"
+- reg: Should contain location and length for watchdog timer register.
+- interrupts: Should contain the list of watchdog timer interrupts.
+- clocks: clocks driving the watchdog timer hardware. This list should be 2
+	clocks. With 2 clocks, the order is wdogclk clock, apb_pclk.
+
+Example:
+	watchdog@66090000 {
+		compatible = "arm,sp805", "arm,primecell";
+		reg = <0x66090000 0x1000>;
+		interrupts = <GIC_SPI 406 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&apb_pclk>,<&apb_pclk>;
+		clock-names = "wdogclk", "apb_pclk";
+	};