[systemtest] Allow using find_in_uart0() without filter Previously, if `None` was passed to `find_in_uart0()` it always used the default filter, which strips message prefixes produced by `LOG_*()` macros in OpenTitan. After this patch, passing `None` results in no filter being applied. Not passing any argument uses the default filter. Additionally, some lint fixes. Signed-off-by: Philipp Wagner <phw@lowrisc.org>
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