platform:x86: add Intel P-Unit mailbox IPC driver
This driver provides support for P-Unit mailbox IPC on Intel platforms. The heart of the P-Unit is the Foxton microcontroller and its firmware, which provide mailbox interface for power management usage. Signed-off-by: NQipeng Zha <qipeng.zha@intel.com> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NDarren Hart <dvhart@linux.intel.com>
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