Qualcomm Interprocessor Communication Spinlock

--Dedicated Hardware Implementation--
Required properties:
- compatible : should be "qcom,ipc-spinlock-sfpb"
- reg : the location and size of the spinlock hardware
- qcom,num-locks : the number of locks supported

Example:

	qcom,ipc-spinlock@fd484000 {
		compatible = "qcom,ipc-spinlock-sfpb";
		reg = <0xfd484000 0x1000>;
		qcom,num-locks = <32>;
	};

--LDREX Implementation--
Required properties:
- compatible : should be "qcom,ipc-spinlock-ldrex"
- reg : the location and size of the shared lock memory

Example:

	qcom,ipc-spinlock@fa00000 {
		compatible = "qcom,ipc-spinlock-ldrex";
		reg = <0xfa00000 0x200000>;
	};