usb: dwc3: let non-DT platforms pass tx-fifo-resize flag;

in case we're not in a DT boot, we should
still be able to tell the driver how to behave.

In order to be able to pass flags to the driver,
we introduce platform_data structure which the
core driver should use.

Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --cc drivers/usb/dwc3/core.c
Simple merge

diff --cc drivers/usb/dwc3/platform_data.h
Simple merge