clocksource: sh_mtu2: Remove FSF mail address from GPL notice

clocksource: sh_mtu2: Remove FSF mail address from GPL notice

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: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Wolfram Sang <wsa@sang-engineering.com>
(cherry picked from commit 24c8f71707087eb177b45f4a24faedaa0d8f0287)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>