[PATCH v4 0/3]: usb: gadget: fixes for dummy_hcd

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Here is v4 of the fixes for dummy_hcd

The first patch is a simplification / refactoring for dummy_start(),
the second fixes support for streams that was broken since the
introduction of the can_do_streams field in commit 
14aec589327a6fc4035f5327d90ac5548f501c4c and the third (and
most interesting one) moves dummy_hcd from jiffies to hrtimers
which allows the emulation to be reasonably accurate regardless
of the HZ value in the user's kernel.

v4 implements all review suggestions so far and the main change
is the rewrite of the dummy_start() simplification patch that
was completely wrong in the previous iteration (thanks Alan
Stern for pointing this out).

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