usb: phy-msm-qusb-v2: Move qusb_phy_host_init to qusb_phy_init

Since notify_connect can be called from dwc3-msm driver and
hub driver, multiple phy initilizations is happening when HUB
is connected to the device.

Initialize qusb-phy for host mode in qusb_phy_init so that it
gets called only on core reset with HOST MODE FLAG set to
avoid multiple phy initialzations.

Change-Id: Iaa2a1dbedfd7968b8690847e4f219e205362c4a8
Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org>