usb: fix bulk endpoint configuration for high-speed capable device

In the current USB device support, the sizes of bulk endpoint
are mostly configure through Kconfig and do not care if a device
is high-speed capable. The information if a USB device controller
supports high-speed comes from devicetree. Add a Kconfig option to
map this information and configure bulk endpoint sizes
accordingly.

Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>