arm64: dts: renesas: r8a779g0: Add CMT node

Signed-off-by: Thanh Quan <thanh.quan.xn@renesas.com>
[wsa: merged the fixes into this one and rebased]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20221104151135.4706-3-wsa+renesas@sang-engineering.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>