clk: sifive: Add a driver for the SiFive FU740 PRCI IP block

Add driver code for the SiFive FU740 PRCI IP block. This IP block
handles reset and clock control for the SiFive FU740 device and
implements SoC-level clock tree controls and dividers.

The link of unmatched as follow, and the U740-C000 manual would
be present in the same page as soon.
https://www.sifive.com/boards/hifive-unmatched

This driver contains bug fixes and contributions from
Henry Styles <[email protected]>
Erik Danie <[email protected]>
Pragnesh Patel <[email protected]>

Signed-off-by: Zong Li <[email protected]>
Reviewed-by: Pragnesh Patel <[email protected]>
Acked-by: Palmer Dabbelt <[email protected]>
Cc: Henry Styles <[email protected]>
Cc: Erik Danie <[email protected]>
Cc: Pragnesh Patel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[[email protected]: Include header to silence sparse]
Signed-off-by: Stephen Boyd <[email protected]>

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