timer: cAVS cycle count is lock free

Select the Kconfig option noting that the cavs (intel adsp)
timer driver provides a lock free cycle count accessor and
therefore can be used with a spin lock time limit assert.

Signed-off-by: Tom Burdick <thomas.burdick@intel.com>

drivers/timer/Kconfig.cavs

@@ -19,6 +19,7 @@ config INTEL_ADSP_TIMER
 	select CAVS_TIMER
 	select TICKLESS_CAPABLE
 	select TIMER_HAS_64BIT_CYCLE_COUNTER
+	select SYSTEM_CLOCK_LOCK_FREE_COUNT
 	help
 	  The DSP wall clock timer is a timer driven directly by
 	  external oscillator and is external to the CPU core(s).