This patch updates the serial gadget driver:

 - The bulk is Al Borcher's version 2.0 updates:

     * Use the new utilities to build config descriptors from tables.

     * Add CDC ACM support, which brings lots of goodness including
       interop with Windows.

     * Work better given PXA 25x hardware automagic.

 - I have a few minor tweaks.

     * Match the recent tty API change:  from_user is gone!!

     * Define new product ID for the CDC ACM version, so Windows
       registry won't get confused by the non-ACM version.

     * Add OTG descriptor

     * Allocates packet buffers more efficiently on platforms like
       OMAP: use kmalloc not the dma-coherent allocator.

Al has some docs on how to talk to Windows this, including an INF file.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>