Align the MMU area for SCMI shared buffer on section size; use the ALIGN macro in mmu_set_region_dcache_behaviour call. Since commitd877f8fd0f("arm: provide a function for boards init code to modify MMU virtual-physical map") the parameter of mmu_set_region_dcache_behaviour need to be MMU_SECTION_SIZE aligned. Fixes:240720e905("firmware: scmi: mailbox/smt agent device") Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>