usb: dwc3: gadget: add support for Bursts

We already have the value from gadget drivers,
just need to pass it to our controller.

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
[idos@codeaurora.org: Integrate in this commit also the change
"USB: use usb_endpoint_maxp() instead of le16_to_cpu()" 29cc8897
from Linux kernel 3.1. The reason why this change was not
cherry-picked separately is because I wanted to reduce impact
on msm code tree, and only change dwc3 driver.]
Signed-off-by: Ido Shayevitz <idos@codeaurora.org>