musb: cppi41: tweak usb-storage performance a little

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Daniel,

could you give those a two chance? In my host-mode testing the perfomance of
 dd if=/dev/null of=/dev/sda2 bs=4096 count=40000
went from 
 163840000 bytes (164 MB) copied, 12.2608 s, 13.4 MB/s
to
 163840000 bytes (164 MB) copied, 8.80694 s, 18.6 MB/s

If you keep lowering the timer as you do now you can remove the timer and
just poll for the register :)

Sebastian

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