Add the functions for QUP4 (spi, uart, uim & i2c), sdc3 and audio_pcm as
derived from the downstream gpiomux configuration.

Also sort the functions alphabetically, while we're at it.
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210911232707.259615-2-luca@z3ntu.xyzSigned-off-by: Linus Walleij <linus.walleij@linaro.org>