ipq807x: move AQR driver from built-in to kmod

ipq807x: move AQR driver from built-in to kmod

ipq807x does not compile-in hwmon core, and this is leading to the hwmon
code in AQR driver not being compiled due to IS_REACHABLE(CONFIG_HWMON)
evaluating to false as hwmon is being built as a module.

So, lets not compile-in Aquantia PHY driver so it can be included as kmod
instead to have functioning hwmon.

This allows using the thermal sensors in AQR-s as thermal zones for
cooling devices like fans.

Signed-off-by: Robert Marko <robimarko@gmail.com>