Fix the unbalanced call to the pm_runtime_disable when removing the
module.  pm_runtime_enable is not called nor is the pm_runtime setup in
the code.  Remove the i2c_remove function and the pm_runtime_disable.

Fixes: 1a476abc ("tas2770: add tas2770 smart PA kernel driver")
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20200918190548.12598-5-dmurphy@ti.comSigned-off-by: Mark Brown <broonie@kernel.org>