ASoC: Clean up {hp,mic}-det-gpio handling

Merge series from Geert Uytterhoeven <geert+renesas@glider.be>:

The "gpio" suffix for GPIO consumers was deprecated a while ago, in
favor of the "gpios" suffix.  However, there are still several users of
the "hp-det-gpio" and "mic-det-gpio" properties, in DT bindings,
drivers, and DT source files.

Drivers that use gpiolib handle both the deprecated and new properties
transparently, but that is not the case when using of_property_*() calls
directly.