arm64: dts: r8a7796: Add OPPs table for cpu devices

Current, OPP tables are defined temporary,
they are being evaluated and adjust in future.

Based in part on work by Hien Dang.

Signed-off-by: Dien Pham <dien.pham.ry@rvc.renesas.com>
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
[simon: consolidated several patches into one]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
1 file changed