imx8mp: Add clock tree

Add clock tree for imx8mp SOC. This provides clocks sufficient for
several sub systems to work including USB and SD/MMC.

Reviewed by: manu
Sponsored by: The FreeBSD Foundatio

imx8mp: Add clock tree

Add clock tree for imx8mp SOC. This provides clocks sufficient for
several sub systems to work including USB and SD/MMC.

Reviewed by: manu
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D46642

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