usbdevfs: capabilities & scatter-gather support v4 (final)

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And here is the hopefully final version of this patchset.

Changes in v2:
[PATCH 2/4] usbdevfs: Add a USBDEVFS_GET_CAPABILITIES ioctl
-making the caps ioctl parameter u32 instead of u64 
[PATCH 4/4] usbdevfs: Use scatter-gather lists for large bulk
-only use scatter-gather lists for large bulk transfers, not for other
 large transfers (ie isoc).
-add a missing "totlen -= u;" statement in the loop allocating
 the per sg entry buffers, causing the last buffer to always
 be USB_SG_SIZE, even if a smaller buffer would suffice

Changes in v3:
[PATCH 2/5] usbdevfs: Add a USBDEVFS_GET_CAPABILITIES ioctl
-change how caps is initialized in proc_get_capabilities()
[PATCH 3/5] usbdevfs: Don't advertise USBDEVFS_CAP_BULK_CONTINUATION
-rename no_stop_on_short_tx to no_stop_on_short
[PATCH 5/5] usb/hcd: Ensure scatter-gather is not used for isoc
-new patch

Changes in v4:
[PATCH 2/4] usbdevfs: Add a USBDEVFS_GET_CAPABILITIES ioctl
-return 0 from the USBDEVFS_GET_CAPABILITIES ioctl instead of the caps
-merged in the patch for not advertising USBDEVFS_CAP_BULK_CONTINUATION on XHCI

Regards,

Hans
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