regulator: qpnp-lcdb: Add support for NCP symmetry with LDO

Add a device tree property which enables NCP symmetry. This
configuration in HW enables the NCP voltage to follow LDO.

Change-Id: If44b049a3ecd031f111dcb8477166925a0d01914
Signed-off-by: Jishnu Prakash <jprakash@codeaurora.org>