dt-bindings: firmware: imx: Add more system controls and PM clock types

Add more system controls and PM clock types for usage.

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>