this ASFv4 USB library change fixes USB transfer.
two transfer-size issues existed:
- on multi-packet transfer if the last packet was less than the
USB transfer packet size, the packet would be received but not
acknowledged
- during normal transfer the packet size of a previous packet set
the size of the current packet, ignoring the actual transfer size
transfer with a combination of partial or full USB single packet,
USB multi-packet, max transfer, and control endpoint sizes was
successfully tested (in bytes): 4, 32, 64, 128, 129, 512, 516,
544, 576, 640, 641, 1024, 1028
Change-Id: Ic4e64168e865362e12e0b76386f964895b8b6c20
f278032e9f