dt-bindings: arm: fsl: add scu binding doc

The System Controller Firmware (SCFW) is a low-level system function
which runs on a dedicated Cortex-M core to provide power, clock, and
resource management. It exists on some i.MX8 processors. e.g. i.MX8QM
(QM, QP), and i.MX8QX (QXP, DX).

Cc: Shawn Guo <[email protected]>
Cc: Sascha Hauer <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: [email protected]
Reviewed-by: Rob Herring <[email protected]>
Reviewed-by: Sascha Hauer <[email protected]>
Signed-off-by: Dong Aisheng <[email protected]>
Signed-off-by: Shawn Guo <[email protected]>

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