power: qpnp-smbcharger: avail of simpler regulator registration api

Change,
a0c7b164 regulator: of: Provide simplified DT parsing method
enables to register a regulator without constructing an regulator_init_data
structure. The regulator_init_data is instantiated within the
registration api and is filled with information by parsing the regualtor
device node.

Avail of this convenience while registering OTG regulators in the
qpnp-smbcharger driver.

Change-Id: I2ba14d3bea7d839f8055401d69d7461d2f54aa8e
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>