csky-for-linus-5.4-rc1: arch/csky patches for 5.4-rc1 This round of csky subsystem just some fixups. Fixup: - Fixup mb() synchronization problem - Fixup dma_alloc_coherent with PAGE_SO attribute - Fixup cache_op failed when cross memory ZONEs - Optimize arch_sync_dma_for_cpu/device with dma_inv_range - Fixup ioremap function losing - Fixup arch_get_unmapped_area() implementation - Fixup defer cache flush for 610 - Support kernel non-aligned access - Fixup 610 vipt cache flush mechanism - Fixup add zero_fp fixup perf backtrace panic - Move static keyword to the front of declaration - Fixup csky_pmu.max_period assignment - Use generic free_initrd_mem() - entry: Remove unneeded need_resched() loop CI-Tested: https://gitlab.com/c-sky/buildroot/pipelines/77689888