clocksource/drivers/arm_global_timer: Add the COMPILE_TEST option

Change the Kconfig option logic to fullfil with the current approach,
allowing the user to compile the driver on different platforms.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 8055b37..1711079 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -304,8 +304,9 @@
 	  hardware anomalies of missing events.
 
 config ARM_GLOBAL_TIMER
-	bool
+	bool "Support for the ARM global timer" if COMPILE_TEST
 	select CLKSRC_OF if OF
+	depends on ARM
 	help
 	  This options enables support for the ARM global timer unit