cache: add sifive composable cache driver

This driver is currently responsible for enabling all ccache ways.
Composable cache could be configure as RAM or cache, we will use it as
RAM at the beginning to put the u-boot SPL there. In u-boot proper
phrase, we will use the composable cache as cache, and try to enable the
cache ways.

Signed-off-by: Zong Li <[email protected]>
Reviewed-by: Sean Anderson <[email protected]>
Reviewed-by: Rick Chen <[email protected]>

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