regulator: twl: Fix checkpatch issue

Fix the following checkpatch warnings.

  WARNING: please, no space before tabs
  WARNING: space prohibited between function name and open parenthesis '('

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>