Based on CAF implementation with egpio/wake_reg support removed.

Similar function names were merged to reduce total number of functions.
Signed-off-by: Iskren Chernev <iskren.chernev@gmail.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210723192352.546902-3-iskren.chernev@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>