trace-events: Clean up with scripts/cleanup-trace-events.pl again

Event qxl_render_blit_guest_primary_initialized is unused since commit
c58c7b95, drop it.

Commit 42e5b4c9 moved hw/ppc/xics.c to hw/intc/xics.c without updating
the comment in trace-events.

"scripts/cleanup-trace-events.pl trace-events | diff trace-events" is
now clean again.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>