Add Device Tree binding document for the NVIDIA Tegra central activity monitor device. Bug 3625675 Change-Id: I85dc848b561802dd749f59c0a57654264f83f082 Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2705397 GVS: Gerrit_Virtual_Submit