usb: dwc2: gadget: do not reset during core phy init

usb: dwc2: gadget: do not reset during core phy init

After the commit 1e868545f2bb ("usb: dwc2: gadget: Move gadget phy
init into core phy init"), dwc2 gadget mode with f_fs enumeration
is blocked from recent host kernel. It is because, the commit adds
more usb reset for gadget case, so do not reset during core phy
init for gadget.

Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
(cherry picked from commit a8cc687cf40f5c3781b23b08b3dd1ef978895449)
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Change-Id: I6c4850983a4f397ebc7b10191bf293e1c4eeebba