regulator: da9052: add device tree support

This patch adds device tree support for dialog regulators

Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Liam Girdwood <lrg@ti.com>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Ashish Jangam <ashish.jangam@kpitcummins.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>