m68k{,nommu}: Wire up new timerfd syscalls

m68k{,nommu}: Wire up the new timerfd syscalls, which were introduced in
commit 4d672e7a ("timerfd: new timerfd API").

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>