tracing: Constify struct event_trigger_ops

tracing: Constify struct event_trigger_ops

'event_trigger_ops mwifiex_if_ops' are not modified in these drivers.

Constifying these structures moves some data to a read-only section, so
increase overall security, especially when the structure holds some
function pointers.

On a x86_64, with allmodconfig, as an example:
Before:
======
   text	   data	    bss	    dec	    hex	filename
  31368	   9024	   6200	  46592	   b600	kernel/trace/trace_events_trigger.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  31752	   8608	   6200	  46560	   b5e0	kernel/trace/trace_events_trigger.o

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/66e8f990e649678e4be37d4d1a19158ca0dea2f4.1741521295.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>