XLR dcache is fully coherent across CPUs, so avoid unnecessary dcache
flushes.
Signed-off-by: NJayachandran C <jayachandranc@netlogicmicro.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2729/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>