powerpc/ps3: Update debug message for irq_set_chip_data()

commit ec775d0e ("powerpc: Convert to new irq_*
function names") changed a call from set_irq_chip_data() to
irq_set_chip_data(), but forgot to update the corresponding debug message

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>