remove unneeded includes

Add JH7100 I2C clocks.

ok miod@, jsg@

Add stfrng(4), a driver for the random number generator on the JH7110 SoC.

ok joel@, jca@

Instead of adjusting PLL0 to scale the CPU frequency, use the divider
of the actual CPU clock. This prevents one of the GMAC0 clocks changing
when we change the CPU frequency, which would break one

Instead of adjusting PLL0 to scale the CPU frequency, use the divider
of the actual CPU clock. This prevents one of the GMAC0 clocks changing
when we change the CPU frequency, which would break one of the Ethernet
ports on the VisionFive 2 v1.2a.

However, since the firmware configures PLL0 to 1 GHz, we still need to
bump it up to 1.5 GHz in order to reach the highest supported CPU clock
rates.

ok jmatthew@, jca@, jsing@

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Implement a few more clocks related to the GMAC.

ok jsing@

Add (limited) support for setting PPL0 on JH7110.

ok jsing@

Add JH7110 I2C clocks.

ok jsing@

Add a few more JH7110 clocks.

ok jsing@

Implement support for the GPIOs on the JH7110. Makes it possible to reboot
the VisionFive 2 from OpenBSD.

ok jsing@

Add a bunch of clocks for GMAC0 and GMAC1 on the JH7110 SoC.
Based on an initial diff from jsing@

ok jsing@

Add initial support for StarFive VisionFive V2 to stfclock(4).

This adds initial support for the syscrg and pll clocks on the StarFive
VisionFive V2 JH7110 SoC.

ok kettenis@

Handle clock that can't be gated as a no-op.

ok patrick@

Add stftemp(4), a driver for the temperature sensor integrated on the
StarFive JH7100 SoC.

ok jsg@

Add stfclock(4), a driver for the clock controller found on the StarFive
JH7100 SoC.

ok jsg@