[MIPS] Replace board_timer_setup function pointer by plat_timer_setup.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

---
diff --git a/arch/mips/vr41xx/common/init.c b/arch/mips/vr41xx/common/init.c
index 915bfa5..625f22f 100644
--- a/arch/mips/vr41xx/common/init.c
+++ b/arch/mips/vr41xx/common/init.c
@@ -47,7 +47,7 @@
 		mips_hpt_frequency = tclock / 4;
 }
 
-static void __init setup_timer_irq(struct irqaction *irq)
+void __init plat_timer_setup(struct irqaction *irq)
 {
 	setup_irq(TIMER_IRQ, irq);
 }
@@ -55,7 +55,6 @@
 static void __init timer_init(void)
 {
 	board_time_init = setup_timer_frequency;
-	board_timer_setup = setup_timer_irq;
 }
 
 void __init plat_mem_setup(void)