drivers/ETM: fix error in invalid cs_id

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5YCYK



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trace id is invalid(trace_id = 0 or trace_id > 0x6F). In this situation,
we cannot parse trace data using perf tool. so make trace_id in the
range of 1 to 0x6F in coresight_get_trace_id().

Signed-off-by: Junhao He <hejunhao3@huawei.com>