arm: rmobile: Add support R8A7793

Renesas R8A7793 is CPU with Cortex-A15. This supports the basic register
definition and GPIO and framework of PFC.

Signed-off-by: Hisashi Nakamura <hisashi.nakamura.ak@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
8 files changed