USB: Improve "New device found" printout message

Use a colon instead of a comma, like the debug message after this one
does.

Do not print a space after `bcdDevice=`. This was introduced as the
formatting was copied from `lsusb -v` printout, but lsusb output has
preceding spaces, this message does not, so it ends up looking odd.

Previously the output ended up looking like
`idProduct=a000, bcdDevice= 1.00` if the first hex character of
bcdDevice was 0.

Signed-off-by: Martin Rys <martin@archlinux.org>
Link: https://patch.msgid.link/94a023c9-80de-4c84-85bf-7846de97c240@archlinux.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>