staging: octeon-usb: correct driver name in Kconfig help text

The module name in the Makefile and in the driver source file is
octeon-hcd, so correct the Kconfig text to be the same.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>