[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/qemu/q-setup.c b/arch/mips/qemu/q-setup.c
index e100d60..8413943 100644
--- a/arch/mips/qemu/q-setup.c
+++ b/arch/mips/qemu/q-setup.c
@@ -11,7 +11,7 @@
 	return "Qemu";
 }
 
-static void __init qemu_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 */
@@ -23,7 +23,5 @@
 void __init plat_mem_setup(void)
 {
 	set_io_port_base(QEMU_PORT_BASE);
-	board_timer_setup = qemu_timer_setup;
-
 	qemu_reboot_setup();
 }