set/way instructions "dc cisw" which is used by the "dcache flush" command
only flushing CPU data caches from L1 -> L2 -> L3 to system memory cache in
cache coherency unit, hence this patch enables data flush from system
memory cache of CCU into DDR memory.
Signed-off-by: Tien Fong Chee <tien.fong.chee@altera.com>
