ARM: renesas: Drop remnants of R8A7740 support

Last board with this SoC has been removed in commit
0fb054b3f7ea ("arm: Remove armadillo-800eva board")
in August 2022. Drop the rest of unused code.

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