drm/amdkfd: Check debug trap enable before write dbg_ev_file

From Lin.Cao
e6ea3b8fe398915338147fe54dd2db8155fdafd8 in linux-6.6.y/6.6.50
547033b593063eb85bfdf9b25a5f1b8fd1911be2 in mainline linux

update drm to linux 6.6.12

Thanks to the OpenBSD Foundation for sponsoring this work.