[MIPS] Kill duplicated setup_irq() for cp0 timer

Also many plat_timer_setup() can be killed too.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/bcm47xx/time.c

@@ -46,10 +46,3 @@ void __init plat_time_init(void)
 	/* Set MIPS counter frequency for fixed_rate_gettimeoffset() */
 	mips_hpt_frequency = hz;
 }
-
-void __init
-plat_timer_setup(struct irqaction *irq)
-{
-	/* Enable the timer interrupt */
-	setup_irq(7, irq);
-}