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* [DM/FEATURE] Support hardware mailbox * [MAILBOX/PIC] Add PIC Mailbox drivers. The mailbox device(s) may be instantiated in one of three equivalent way: Device Tree node, eg.: ```dts interrupt-controller@0 { interrupt-controller; #interrupt-cells = <1>; }; pic_mailbox@10000 { compatible = "rt-thread,pic-mailbox"; reg = <0x10000 0x100>; position = <0>; interrupts = <34>; peer-interrupts = <35>; uid = <0>; #mbox-cells = <1>; }; ``` Signed-off-by: GuEe-GUI <2991707448@qq.com>