usb: Fix up r8a66597-hcd section mismatches.

The _remove() routine is flagged __init_or_module, despite only being
used in a __devexit context. As the rest of the driver is already
balanced out with __devinit, switch to __devexit and __devexit_p()
wrapping.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>