driver: usb_dc_sam_usbhs: Restore EP0 after detach

SAM V71 Xplained Ultra failed to re-enumerate on the bus after device
detach-attach sequence. The device was recognized by the host, but it
was not responding to control transfers, i.e. it was not acknowledging
SETUP data. Make device acknowledge SETUP data by reconfiguring EP0
when necessary.

Signed-off-by: Tomasz Moń <tomasz.mon@nordicsemi.no>