starfive: add a syscon driver

It serves the purpose of attaching syscon devices as early as possible;
this is required for early attachment of the PLL clock driver.

Sponsored by: The FreeBSD Founda

starfive: add a syscon driver

It serves the purpose of attaching syscon devices as early as possible;
this is required for early attachment of the PLL clock driver.

Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D44270

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