dt-bindings: phy: Add binding for Qualcomm PCIe2 PHY

Qualcomm PCIe2 PHY controller

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The Qualcomm PCIe2 PHY is a Synopsys based phy found in a number of Qualcomm

platforms.

Required properties:

 - compatible: compatible list, should be:

	       "qcom,qcs404-pcie2-phy", "qcom,pcie2-phy"

 - reg: offset and length of the PHY register set.

 - #phy-cells: must be 0.

 - clocks: a clock-specifier pair for the "pipe" clock

 - vdda-vp-supply: phandle to low voltage regulator

 - vdda-vph-supply: phandle to high voltage regulator

 - resets: reset-specifier pairs for the "phy" and "pipe" resets

 - reset-names: list of resets, should contain:

		"phy" and "pipe"

 - clock-output-names: name of the outgoing clock signal from the PHY PLL

 - #clock-cells: must be 0

Example:

 phy@7786000 {

	compatible = "qcom,qcs404-pcie2-phy", "qcom,pcie2-phy";

	reg = <0x07786000 0xb8>;

	clocks = <&gcc GCC_PCIE_0_PIPE_CLK>;

	resets = <&gcc GCC_PCIEPHY_0_PHY_BCR>,

	         <&gcc GCC_PCIE_0_PIPE_ARES>;

	reset-names = "phy", "pipe";

	vdda-vp-supply = <&vreg_l3_1p05>;

	vdda-vph-supply = <&vreg_l5_1p8>;

	clock-output-names = "pcie_0_pipe_clk";

	#clock-cells = <0>;

	#phy-cells = <0>;

 };