clocksource/drivers/cadence_ttc: Add the COMPILE_TEST option

Increase the compilation test coverage by adding the COMPILE_TEST option.

The driver depends on the common clock framework, thus the dependency added
on COMMON_CLK.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index c2b87b4..badef72 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -95,7 +95,10 @@
 	  Enables support for the VT8500 driver.
 
 config CADENCE_TTC_TIMER
-	bool
+	bool "Cadence TTC timer driver" if COMPILE_TEST
+	depends on COMMON_CLK
+	help
+	  Enables support for the cadence ttc driver.
 
 config ASM9260_TIMER
 	bool