[MIPS] Nuke redeclarations of board_time_init.

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

arch/mips/ite-boards/generic/it8172_setup.c

@@ -59,7 +59,6 @@ extern void it8172_restart(char *command);
 extern void it8172_halt(void);
 extern void it8172_power_off(void);
 
-extern void (*board_time_init)(void);
 extern void it8172_time_init(void);
 extern void it8172_timer_setup(struct irqaction *irq);
 

arch/mips/philips/pnx8550/common/setup.c

@@ -49,7 +49,6 @@ extern void pnx8550_machine_halt(void);
 extern void pnx8550_machine_power_off(void);
 extern struct resource ioport_resource;
 extern struct resource iomem_resource;
-extern void (*board_time_init)(void);
 extern void pnx8550_time_init(void);
 extern void pnx8550_timer_setup(struct irqaction *irq);
 extern void rs_kgdb_hook(int tty_no);