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Designed before a standard set of cache management operations defined in RISC-V, earlier T-Head cores like C906 and C910 provide CMO through the customized extension XTheadCMO, which has been used in the CV1800B port of U-Boot. This patch splits XTheadCMO-related code into a generic module, allowing SoCs shipping T-Head cores to share the code. Link: https://github.com/XUANTIE-RV/thead-extension-spec Signed-off-by: Yao Zi <ziyao@disroot.org> Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>