WIP: HID: transport: spi: add Apple SPI transport

WIP: HID: transport: spi: add Apple SPI transport

Keyboard and trackpad of Apple Sillicon SoCs (M1, M1 Pro/Max) laptops
are are HID devices connected via SPI.

This is the same protocol as implemented by applespi.c. It was not
noticed that protocol is a transport for HID. Adding support for ACPI
based Intel MacBooks will be done in a separate commit.

How HID is mapped in this protocol is not yet fully understood.

Microsoft has a specification for HID over SPI [1] incompatible with the
transport protocol used by Apple.

[1] https://docs.microsoft.com/en-us/windows-hardware/drivers/hid/hid-over-spi

Signed-off-by: Janne Grunau <j@jannau.net>