usb: cdns3: fix spelling mistake and rework grammar in text

The text contains a spelling mistake, "to" should be "too"
so fix this and re-work the grammar to make it more readable.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Felipe Balbi <balbi@kernel.org>
Link: https://lore.kernel.org/r/20200122234437.2829803-1-colin.king@canonical.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>