scripts/tracing: Remove scripts/tracing/draw_functrace.py

The draw_functrace.py hasn't worked in years. There's better ways to
accomplish the same thing (via libtracefs). Remove it.

Link: https://lore.kernel.org/linux-trace-kernel/[email protected]/

Cc: Masami Hiramatsu <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Uday Shankar <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Link: https://lore.kernel.org/[email protected]
Signed-off-by: Steven Rostedt (Google) <[email protected]>

Author: rostedt