regulator: Add support for regulator-boot-on device tree property ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

regulator: allow to use it with non DT device ...

this will use the device name as regulator name

with the same Algo as clkdev for lookup

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Add initial regulator support ...

Provide minimal regulator support. Only supported operations are enabling
and disabling regulators. Association of devices with their regulators is
limited to devicetree only. If regulator support is disabled the API expands
to static inline stubs so consumers can still use the API.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>