arc: define and use PTAG AUX regs for MMUv3 only
DC_PTAG and IC_PTAG registers only exist in MMUv3.
Signed-off-by: NAlexey Brodkin <abrodkin@synopsys.com>
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DC_PTAG and IC_PTAG registers only exist in MMUv3.
Signed-off-by: NAlexey Brodkin <abrodkin@synopsys.com>