power: smbcharger: Use Wipower charger type for dc charging path

On certain platforms the DC path could be connected to Wipower charge
input. Support Wipower as the DC path charger type.

Change-Id: I5368aff2c826e6d3ea3037602001093acfa60a38
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>