coresight: etm4x: Safe access for TRCQCLTR

ETM4x implements TRCQCLTR only when the Q elements are supported
and the Q element filtering is supported (TRCIDR0.QFILT). Access
to the register otherwise could be fatal. Fix this by tracking the
availability, like the others.

Fixes: f188b5e76aae ("coresight: etm4x: Save/restore state across CPU low power states")
Reported-by: Yabin Cui <[email protected]>
Reviewed-by: Mike Leach <[email protected]>
Signed-off-by: Suzuki K Poulose <[email protected]>
Tested-by: Yabin Cui <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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