ARM: renesas: Rename rmobile.h to renesas.h

Rename rmobile.h to renesas.h because all the chips are made
by Renesas, while only a subset of them is from the R-Mobile
line.

Use the following command to perform the rename:

"
$ git grep -l 'include.*rmobile.h' | \
  xargs -I {} sed -i '/include.*rmobile.h/ s@rmobile.h@renesas.h@g' {}
"

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Paul Barker <paul.barker.ct@bp.renesas.com>