thermal: db8500_cpufreq_cooling: Compile with COMPILE_TEST

This driver only has runtime but no build time dependencies, so it can be
built for testing purposes if the Kconfig COMPILE_TEST option is enabled.

This is useful to have more build coverage and make sure that drivers are
not affected by changes that could cause build regressions.
Signed-off-by: NLuis de Bethencourt <luisbg@osg.samsung.com>
Signed-off-by: NEduardo Valentin <edubezval@gmail.com>

drivers/thermal/Kconfig

@@ -266,7 +266,7 @@ config TEGRA_SOCTHERM
 
 config DB8500_CPUFREQ_COOLING
 	tristate "DB8500 cpufreq cooling"
-	depends on ARCH_U8500
+	depends on ARCH_U8500 || COMPILE_TEST
 	depends on CPU_THERMAL
 	default y
 	help