clocksource/drivers/timer-of: Convert last full_name to %pOF

Commit 469869d1 ("clocksource: Convert to using %pOF instead of
full_name") converted all but the one just added before by commit
32f2fea6 ("clocksource/drivers/timer-of: Handle
of_irq_get_byname() result correctly").

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20191016144747.29538-2-geert+renesas@glider.be