ARM: dts: Renesas R9A06G032 base device tree file

This adds the Renesas R9A06G032 bare bone support.

This currently only handles the SYSCTRL block note,
generic parts (gic, architected timer) and a UART.

Signed-off-by: Michel Pollet <michel.pollet@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
[simon: updated MAINTAINERS file
[simon: do not use r9a06g032-sysctrl.h as it is not in the renesas tree yet]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>