usb: phy: qmp: Perform DP_COM_SW_RESET during portselect

In case lane selection is not passed from controller, we can
default to using the HW based portselect signal. But in order
to ensure the signal is correctly latched from the PMIC, the
PHY must be reset using the USB3_DP_COM_SW_RESET register
prior to performing initialization. During this time ensure
that the default pinctrl configuration is selected which
places the pinmux in portselect mode.

Change-Id: I0b9ba53a538fad9f731fd1ca0a9d01751d57a063
Signed-off-by: Jack Pham <jackp@codeaurora.org>