clocksource/drivers/timer-microchip-pit64b: move COMPILE_TEST on type definition

Move COMPILE_TEST to menu type definition. This, along with commit
f611af4 ("ARM: at91: Kconfig: implement PIT64B selection") and the
next one in this series allows simply for driver to compile only on ARM
based platforms which allows further implementing delay timer on top of
PIT64B.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>

Author: claudiubeznea

drivers/clocksource/Kconfig

@@ -716,8 +716,8 @@ config INGENIC_OST
 	  Support for the Operating System Timer of the Ingenic JZ SoCs.
 
 config MICROCHIP_PIT64B
-	bool "Microchip PIT64B support"
-	depends on OF && ARM
+	bool "Microchip PIT64B support" if COMPILE_TEST
+	depends on OF
 	select TIMER_OF
 	help
 	  This option enables Microchip PIT64B timer for Atmel