pwm: omap-dmtimer: Allow compiling with COMPILE_TEST

The dependency on OMAP_DM_TIMER is only a runtime dependency. Also
OMAP_DM_TIMER cannot be enabled without ARCH_OMAP being enabled.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/Kconfig

@@ -328,7 +328,8 @@ config PWM_MXS
 
 config PWM_OMAP_DMTIMER
 	tristate "OMAP Dual-Mode Timer PWM support"
-	depends on OF && ARCH_OMAP && OMAP_DM_TIMER
+	depends on OF
+	depends on OMAP_DM_TIMER || COMPILE_TEST
 	help
 	  Generic PWM framework driver for OMAP Dual-Mode Timer PWM output