TODO:
-- remove the defined feature as kernel versions
-- remove OS wrapper functions
-- remove custom debug and tracing functions
- rework comments and function headers(also coding style)
- Move handling for each individual members of 'union message_body' out
into a separate 'struct work_struct' and completely remove the multiplexer
implementation of each message handler into the callsite of the function
that currently queues the 'host_if_msg'.
- make spi and sdio components coexist in one build
-- turn compile-time platform configuration (BEAGLE_BOARD,
- PANDA_BOARD, PLAT_WMS8304, PLAT_RKXXXX, CUSTOMER_PLATFORM, ...)
- into run-time options that are read from DT
- support soft-ap and p2p mode
- support resume/suspend function
-- replace SIOCDEVPRIVATE commands with generic API functions
-- use wext-core handling instead of private SIOCSIWPRIV implementation
- convert all uses of the old GPIO API from <linux/gpio.h> to the
GPIO descriptor API in <linux/gpio/consumer.h> and look up GPIO
lines from device tree, ACPI or board files, board files should