Both _en_bit and _ops parameters for all DCDCs and FETs are the same, so we
can hardcode it in tps65090_REG macro.

_en_reg can be calculated by _id + 12, so we can also remove it.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked by: Venu Byravarasu <vbyravarasu@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>