RISC-V SoC driver fixes for v6.9-rc3

A fix for the ccache driver which no longer probed after the PLIC driver
was converted to a platform driver. The JH7100 SoC depends on this
driver to provide cache management ops that must be registered with an
arch_initcall, so the ccache driver is partly converted to a platform
driver, registering only the cache management ops with the initcall and
the debug/edac register provision features of the driver as a platform
driver.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
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