phy: msm: usb: Remove dedicated charger type support

Since supply type is now hidden from phy-msm-usb driver (i.e.
EXTCON_USB should only be emitted in the case of SDP or CDP),
remove dedicated charger type usage from this driver.

Change-Id: I0b7e4eee65a8219d22c229d5bbb1292f3cad363a
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>