mfd: rt5033: Fix errorneous defines

Fix regulators on rt5033 by converting some values to bitmasks which were
errorneously not defined as such in the header file.

Cc: Beomho Seo <beomho.seo@samsung.com>
Fixes: 0b271258

 ("mfd: rt5033: Add Richtek RT5033 driver core.")
Signed-off-by: Michael Srba <Michael.Srba@seznam.cz>
Signed-off-by: Lee Jones <lee.jones@linaro.org>