power: smb5: Fix PD capability configuration

Currently, PD capability support can be configured either using
DT property or by default initialization based on PMIC subtype.
However, the DT property value for PD support overrides the default
initialization, rendering the default configuration ineffective.
Fix this by taking a logical OR between the two control methods.

Change-Id: I5d47f80e3b20471ec94a8ea5bddaafee10935952
Signed-off-by: Umang Agrawal <uagrawal@codeaurora.org>