regulator: rc5t583: Simplify RC5T583_REG macro

Simplify RC5T583_REG macro by removing _vout_reg and _ds_reg parameters.

The naming for vout_reg and deepsleep_reg can be replaced by:
.vout_reg       = RC5T583_REG_##_id##DAC,
.deepsleep_reg  = RC5T583_REG_##_id##DAC_DS,

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>