coresight: Fixes for v6.3

Fixes for coresight subsystem includes:
 - Fix etm4_enable_hw to program all the address comparator pairs (instead of
   half of them)
 - Do not access TRCIDR1 register without OSLK cleared in etm4_probe for mmio
   access.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
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