QCA LED Controller Driver.

Required properties:
- compatible: "qca,ledc"
- reg: Base address for LED registers.
- reg-names: Register name for reference.
- qcom,tcsr_ledc_values: The values with which the 12 LED Control registers needs to be initialized with.
- qcom,ledc_blink_indices_cnt: No.of blink registers configured. Allowed value is 0 to 4.
- qcom,ledc_blink_indices: Indices of LEDs which are configured as blink LEDs. No. of entries
                        should correspond to the value in qcom,ledc_blink_indices_cnt.

Optional properties:
- qcom,ledc_blink_idx_src_pair: List of LED index + blink source pairs.

Examples:

qcom: ledc@1937000 {
	compatible = "qca,ledc";
	reg = <0x1937000 0x20070>;
	reg-names = "ledc_base_addr";
	qcom,tcsr_ledc_values = <0x320195 0xA418820 0x16A4A0E6 0x2307B9AC 0x16AD272 \
		0xFFFFFFFF 0x0 0x0 0x7D006F 0x0 0x10482090 0x3FFFFE4>;
	qcom,ledc_blink_indices_cnt = <4>;
	qcom,ledc_blink_indices = <19 20 21 22>;
	qcom,ledc_blink_idx_src_pair = <3 20>, <4 21>, <5 22>;
};