Input: atkbd - receive and use physcode->keycode mapping from FW

Allow the firmware to specify the mapping between the scan code and the
linux keycode. This takes the form of a "linux,keymap" property which is
an array of u32 values, each value specifying mapping for a key.

Signed-off-by: Rajat Jain <rajatja@google.com>
Link: https://lore.kernel.org/r/20200427210259.91330-3-rajatja@google.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>