power: qpnp-smb2: Add dt property to disable STAT SW_OVERRIDE

Add boolean device tree property to disable STAT pin SW_OVERRIDE
default configuration. This is required for enabling main charger
control over enable/disable of slave charger.

STAT pin SW override is disabled by default in case of presence of
parallel charger. But for SMB1390 case, it is required to define
this property to explicitly disable STAT pin SW override in order
to enable the charge pump.

Change-Id: I4539ffbe5c6f1135c212fb7fa13a802020798093
Signed-off-by: Umang Agrawal <uagrawal@codeaurora.org>