[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/sni/setup.c b/arch/mips/sni/setup.c
index e5646b0..4e98feb 100644
--- a/arch/mips/sni/setup.c
+++ b/arch/mips/sni/setup.c
@@ -41,7 +41,7 @@
 extern void sni_machine_halt(void);
 extern void sni_machine_power_off(void);
 
-static void __init sni_rm200_pci_timer_setup(struct irqaction *irq)
+void __init plat_timer_setup(struct irqaction *irq)
 {
 	/* set the clock to 100 Hz */
 	outb_p(0x34,0x43);		/* binary, mode 2, LSB/MSB, ch 0 */
@@ -270,7 +270,6 @@
 #endif
 
 	sni_resource_init();
-	board_timer_setup = sni_rm200_pci_timer_setup;
 
 	_machine_restart = sni_machine_restart;
 	_machine_halt = sni_machine_halt;