power: qcom: smblite: initial version of SMBLITE charger driver

The QPNP SMBLITE charger driver supports the charger peripherals present
in the PMIC PM2250. PM2250 incorporates a single input high-efficiency
switch-mode battery charger for single-cell Lithium batteries.
Register access is provided by the parent device via regmap. Interrupts
are controlled by the parent device, and handlers are registered by the
QPNP SMBLITE charger driver.
The power supply framework is used to communicate battery and usb
properties to userspace and other driver consumers such as fuel gauge,
and USB.

Change-Id: Ia070913ad6b4384619b9001b508f7fe0f1d6a3d6
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>