regulator: da9053: Update regulator for DA9053 BC silicon support

Provide an additional case entry for DA9053_BC in the find_regulator_info()
function in order to support BC type silicon for the DA9053 device.

Signed-off-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@kernel.org>