clocksource/drivers/rockchip: Add COMPILE_TEST option

Increase the compilation test coverage by adding the COMPILE_TEST option.

Due to the dsb() usage in the driver, this driver is only compilable on
ARM and ARM64.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 3ba43f6..0c06103 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -39,8 +39,11 @@
 	select CLKSRC_OF
 
 config ROCKCHIP_TIMER
-	bool
+	bool "Rockchip timer driver" if COMPILE_TEST
+	depends on ARM || ARM64
 	select CLKSRC_OF
+	help
+	  Enables the support for the rockchip timer driver.
 
 config ARMADA_370_XP_TIMER
 	bool