ASoC: rt5651: Only configure OVCD once at set_jack time

Only configure OVCD once at set_jack time, rather then configuring
it on every jack-insertion event and switch to using bit field defines
instead of hardcoding a magic value.

Tested-by: Carlo Caione <carlo@endlessm.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mark Brown <broonie@kernel.org>