power: vm-bms: Add snapshot of qpnp-vm-bms driver

Initial snapshot of vm-bms device driver is taken from msm-3.18
kernel version @ commit f8b6819d0432d6 ("msm: ipa: Fix to
handle NULL pointer dereference")

Add vm-bms, batterydata-interface, battery-lib support
Change spmi driver framework to platform driver framework in 4.9
kernel. Add support to access spmi register via regmap.

Change-Id: Ic2133fcf8dc73e6c1327a8583ccdaa2f5695cfbe
Signed-off-by: Arulpandiyan Vadivel <avadiv@codeaurora.org>
Signed-off-by: Sundara Vinayagam <sundvi@codeaurora.org>