tsl2x7x: remove paragraph about writing to the FSF's mailing address

Do not include the paragraph about writing to the Free Software
Foundation's mailing address from the sample GPL notice. The FSF
has changed addresses in the past, and may do so again. Linux
already includes a copy of the GPL.

Signed-off-by: Enric Balletbo i Serra <eballetbo@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>