Add some delay to avoid reading CSR TXCOUNT too early after
updating it.

For more info about this HW glitch see:
http://lists.arm.linux.org.uk/lurker/message/20090325.150843.f515c02f.en.html
http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20100129/10ba0f8b/attachment.el
http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20100203/09cdb3b4/attachment.el
http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20100203/08b5b249/attachment.el

First applied: "Fix soft lockup in at91 udc driver"
http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=5965Signed-off-by: NAnti Sullin <anti.sullin@artecdesign.ee>
Signed-off-by: NHarro Haan <hrhaan@gmail.com>
Acked-by: NRemy Bohmer <linux@bohmer.net>
Acked-by: NAndrew Victor <linux@maxim.org.za>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>