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H A Dcache.cf2a22678 Fri Nov 17 07:02:17 CST 2017 Alexey Brodkin <abrodkin@synopsys.com> arc: cache: Add required NOPs after invalidation of instruction cache

As per ARC HS databook (see chapter 5.3.3.2) it is required to add
3 NOPs after each write to IC_IVIC which we do from now on.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Eugeniy Paltsev <paltsev@synopsys.com>