Freescale i.MX6 On-Chip OTP Controller (OCOTP) device tree bindings

This binding represents the on-chip eFuse OTP controller found on
i.MX6Q/D, i.MX6DL/S, i.MX6SL, and i.MX6SX SoCs.

Required properties:
- compatible: should be one of
	"fsl,imx6q-ocotp" (i.MX6Q/D/DL/S),
	"fsl,imx6sl-ocotp" (i.MX6SL), or
	"fsl,imx6sx-ocotp" (i.MX6SX), followed by "syscon".
- reg: Should contain the register base and length.
- clocks: Should contain a phandle pointing to the gated peripheral clock.

Example:

	ocotp: ocotp@021bc000 {
		compatible = "fsl,imx6q-ocotp", "syscon";
		reg = <0x021bc000 0x4000>;
		clocks = <&clks IMX6QDL_CLK_IIM>;
	};

Add i.MX6 OCOTP device tree binding documentation
nvmem: Add i.MX6 OCOTP device tree binding documentation

This patch documents the i.MX6 OCOTP device tree binding.

Signed-off-by: Philipp Zabel <db7328bbf81a38b011e8d0f5302fd54c788d0608@pengutronix.de>
Signed-off-by: Srinivas Kandagatla <e9a3fcd7365f8e6a430ada3b68b984cb4aaf0c3e@linaro.org>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>
