logreader: stricter typing
Add typing annotations to logreader.py and verify it with stricter mypy
settings.
Signed-off-by: 
Vincent Stehlé <vincent.stehle@arm.com>
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Add typing annotations to logreader.py and verify it with stricter mypy
settings.
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>