lib: utils/cache: Add SiFive Extensible Cache (EC) driver

Add support for SiFive Extensible Cache (EC) controller with multi-slice
architecture. The driver implements cache maintenance operations through
MMIO register interface.

Co-developed-by: Vincent Chen <[email protected]>
Signed-off-by: Vincent Chen <[email protected]>
Co-developed-by: Samuel Holland <[email protected]>
Signed-off-by: Samuel Holland <[email protected]>
Co-developed-by: Yong-Xuan Wang <[email protected]>
Signed-off-by: Yong-Xuan Wang <[email protected]>
Signed-off-by: Nick Hu <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Anup Patel <[email protected]>

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