timer: APIC timer count is a lock free accessor

Selects the hidden Kconfig to note that the APIC timer's cycle count
accessor is a lock free path and may use the spin lock time limit check.

Signed-off-by: Tom Burdick <[email protected]>

Author: teburd

drivers/timer/Kconfig.apic

@@ -8,6 +8,7 @@ menuconfig APIC_TIMER
 	depends on X86
 	depends on LOAPIC
 	select TICKLESS_CAPABLE
+	select SYSTEM_CLOCK_LOCK_FREE_COUNT
 	help
 	  Use the x86 local APIC in one-shot mode as the system time
 	  source.  NOTE: this probably isn't what you want except on