pwm: Enable Kona PWM to be built for the Cygnus architecture

The Cygnus architecture uses a Kona PWM. This is already present in the
device tree but can't be built actually. Hence, allow the Kona PWM to
be built for the Cygnus architecture.
Signed-off-by: NClément Péron <peron.clem@gmail.com>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Reviewed-by: NScott Branden <scott.branden@broadcom.com>
Acked-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

drivers/pwm/Kconfig

@@ -88,7 +88,9 @@ config PWM_BCM_IPROC
 
 config PWM_BCM_KONA
 	tristate "Kona PWM support"
-	depends on ARCH_BCM_MOBILE
+	depends on ARCH_BCM_MOBILE || ARCH_BCM_CYGNUS || COMPILE_TEST
+	depends on HAVE_CLK && HAS_IOMEM
+	default ARCH_BCM_MOBILE || ARCH_BCM_CYGNUS
 	help
 	  Generic PWM framework driver for Broadcom Kona PWM block.