board: arm: bcmstb: Declare get_ticks in timer.h

In an earlier proposed patch, bcmstb.c implemented timer_read_counter,
but it was updated to implement get_ticks instead.  This patch updates
the declaration in timer.h accordingly.

Signed-off-by: Thomas Fitzsimmons <fitzsim@fitzsim.org>

arch/arm/mach-bcmstb/include/mach/timer.h

@@ -8,6 +8,6 @@
 #ifndef _BCMSTB_TIMER_H
 #define _BCMSTB_TIMER_H
 
-unsigned long timer_read_counter(void);
+uint64_t get_ticks(void);
 
 #endif /* _BCMSTB_TIMER_H */