nios2: fix cache coherency
There is intermittent cache coherency issue caught in toolchian tests.
Revert to use flushd.
Signed-off-by: NLey Foon Tan <lftan@altera.com>
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There is intermittent cache coherency issue caught in toolchian tests.
Revert to use flushd.
Signed-off-by: NLey Foon Tan <lftan@altera.com>