ac,radv,radeonsi: rename thread_trace to sqtt everywhere

ac,radv,radeonsi: rename thread_trace to sqtt everywhere

SQTT stands for SQ Thread Trace but it's shorter.
Note that environment variables aren't renamed because this might
break external applications.

This renames:
- ac_thread_trace_data to ac_sqtt (this is the main struct)
- ac_thread_trace_info to ac_sqtt_data_info
- ac_thread_trace_se to ac_sqtt_data_se
- ac_thread_trace to ac_sqtt_trace (this contains trace only)

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22732>