NFC: update bindings to not require populating dummy values

- qcom,dis-gpio: specific gpio for hardware reset.

- qcom,irq-gpio: specific gpio for read interrupt.

- qcom,clk-src: nfc clock source ("BBCLK2", "RFCLK3", "GPCLK", "GPCLK2", ...)

- qcom,clk-src-gpio: msm gpio clock,used ony if clock source is msm gpio

- qcom,clk-req-gpio: clk-req input gpio for MSM based clocks.

                     not used for pmic implementation

- interrupt-parent: Should be phandle for the interrupt controller

                    that services interrupts for this device.

- interrupts: Nfc read interrupt,gpio-clk-req interrupt

Optional properties:

- qcom,clk-src-gpio: msm gpio clock,used ony if clock source is msm gpio

- qcom,clk-req-gpio: clk-req input gpio for MSM based clocks.

                     not used for pmic implementation

- qcom,clk-gpio: pmic or msm gpio on which bbclk2 signal is coming.

note:

nfc with msm type clock sources (GPCLK and GPCLK 2) require qcom,clk-src-gpio and qcom,clk-req-gpio entries to work propperly.

nfc with pmic type clock sources (BBCLK2 RFCLK3) require the qcom,clk-gpio entry to function properly.

Example:

	i2c@f9925000 { /* BLSP-1 QUP-3 */

			qcom,irq-gpio = <&msmgpio 77 0x00>;

			qcom,dis-gpio = <&msmgpio 93 0x00>;

			qcom,clk-src-gpio = <&msmgpio 78 0x00>;

			qcom,clk-src = "GPCLK2";

			qcom,clk-src = "BBCLK";

			interrupt-parent = <&msmgpio>;

			interrupts = <77 0>;

			qcom,clk-gpio = <&msmgpio 75 0x00>;