ARM: add SCHED_HRTICK config option

As we don't include kernel/Kconfig.hz as this defines HZ values
unsuitable for ARM platforms, add the SCHED_HRTICK to properly configure
the scheduler for hrtimer operation.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/Kconfig

@@ -1655,6 +1655,9 @@ config HZ
 	default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
 	default 100
 
+config SCHED_HRTICK
+	def_bool HIGH_RES_TIMERS
+
 config THUMB2_KERNEL
 	bool "Compile the kernel in Thumb-2 mode"
 	depends on CPU_V7 && !CPU_V6 && !CPU_V6K