regulator: qpnp-lcdb: Add support for LCDB v2 module

LCDB module used in certain new PMICs (PMI632) have some
peripheral register differences and peripheral's major
revision (v2) got updated as well. Add the necessary changes
to support v2 HW.

Change-Id: I785466cb050cd2f4c74e3e0b30c0530765ab3e55
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>