regulator: lp873x: Drop _nlr parameter from LP873X_REGULATOR()

No need to pass _nlr to LP873X_REGULATOR(), use ARRAY_SIZE to calculate it.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>