ARM: dts: msm: Set the DC power supply type to Wireless for msm8994 mtp

MTP has Wipower charger connected to the DC path on PMI8994. Set the
type of the charger to "Wireless" for dc path.

Change-Id: Ic5cf9a740ee5e9ceb1fc19b516a634b53f0c1bf4
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>