Merge "mailbox: msm_qmp: Add multi client functionality"

- qcom,irq-mask : the bitmask to trigger an interrupt.

- interrupt : the receiving interrupt line.

- mbox-desc-offset : offset of mailbox descriptor from start of the msgram.

- priority : the priority of this mailbox compared to other mailboxes.

- #mbox-cells: Common mailbox binding property to identify the number of cells

		required for the mailbox specifier, should be 1.

		qcom,irq-mask = <0x1>;

		interrupt = <0 389 1>;

		mbox-desc-offset = <0x100>;

		priority = <1>;

		mbox-offset = <0x500>;

		mbox-size = <0x400>;

		#mbox-cells = <1>;