sh: SH2007: drop the bad URL info

sh: SH2007: drop the bad URL info

This URL provided is no longer functional, so drop it.

Fixes: 3a598264436e ("sh: SH-2007 board support.")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: linux-sh@vger.kernel.org
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Link: https://lore.kernel.org/r/20230306040037.20350-2-rdunlap@infradead.org
Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>