Fix following compilation issue when SYS_DCACHE_OFF is enable: drivers/misc/scmi_agent.c:128: undefined reference to `mmu_set_region_dcache_behaviour' when SYS_DCACHE_OFF is enable, mmu_set_region_dcache_behaviour() must be defined. Signed-off-by: Patrice Chotard <patrice.chotard@st.com> Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>