usb: host: ehci-dbg: use C89-style comments

This patch fixes coding style issues reported by checkpatch.

Coding style demands usage of C89-style comments and a specific format
when it's multiline.

This also removes the Free Software Foundation address because FSF can
change it again.

Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>