ARM: sa11x0/pxa: get rid of get_clock_tick_rate

The last user of this function is gone, so remove it. The clock API
should now be used to get clock rates.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>

arch/arm/mach-pxa/include/mach/hardware.h

@@ -303,8 +303,6 @@
  */
 extern unsigned int get_memclk_frequency_10khz(void);
 
-/* return the clock tick rate of the OS timer */
-extern unsigned long get_clock_tick_rate(void);
 #endif
 
 #endif  /* _ASM_ARCH_HARDWARE_H */