Prevent crash when dumping large buffers when tracing

When we dump our buffers (or logs) while a trace is happening, SystemUI
would crash if the name of the buffer is longer than 127 chars.

Prevent that crash by truncating this name for the Trace sectionName

Test: manual: add a tile with a long buffer name, start a trace and dump
Fixes: 340912920
Flag: NA
Change-Id: I11087ed9d093f2943f8371f41f171f401b2bfc72