ARM: mx3: dynamically allocate mxc_rnga devices

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
diff --git a/arch/arm/plat-mxc/devices/Kconfig b/arch/arm/plat-mxc/devices/Kconfig
index 1be4476..f34c139 100644
--- a/arch/arm/plat-mxc/devices/Kconfig
+++ b/arch/arm/plat-mxc/devices/Kconfig
@@ -62,6 +62,10 @@
 config IMX_HAVE_PLATFORM_MXC_PWM
 	bool
 
+config IMX_HAVE_PLATFORM_MXC_RNGA
+	bool
+	select ARCH_HAS_RNGA
+
 config IMX_HAVE_PLATFORM_MXC_W1
 	bool