The driver forgets to call regulator_bulk_disable()

Add the missed call to fix it.

Fixes: 33ada14a ("ASoC: add rt5665 codec driver")
Signed-off-by: Zhang Shurong <zhang_shurong@foxmail.com>
Link: https://lore.kernel.org/r/tencent_A560D01E3E0A00A85A12F137E4B5205B3508@qq.comSigned-off-by: Mark Brown <broonie@kernel.org>