ASoC: rt5659: Remove the routing path of the power widget "LDO2"

This patch removes the routing path of the power widget "LDO2", and it
should be depended on the hardware design. The power widget "LDO2" should
add the routing path with the MICBIAS in the machine driver that is
reasonable.

Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>