usb: host: fotg210: fix the endpoint's transactional opportunities calculation

Now that usb_endpoint_maxp() only returns the lowest
11 bits from wMaxPacketSize, we should make use of the
usb_endpoint_* helpers instead and remove the unnecessary
max_packet()/hb_mult() macro.

Signed-off-by: Kelly Devilliv <kelly.devilliv@gmail.com>
Link: https://lore.kernel.org/r/20210627125747.127646-3-kelly.devilliv@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>