Add option to fully disable graphics output from DT

[zhovner]

Add DT overlays to disable DT nodes, their supply regulators / power domains, including dependencies, so that the whole graphics pipeline could be powered down when booted to a “No Graphics” target

• EVB1 board
• Sige5 board
• NanoPi M5 board
• Rock 4D board

[zhovner]

It should be in NO Graphics boot option