ASoC: rt298: fix jack type detect error

rt298_jack_detect may be called before card is instantiated. And
snd_soc_dapm_force_enable_pin will not work in that case. So, update
bit manually by regmap_update_bits.

Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>