feat(imx8m): enable snvs privileged registers access

Allow non-privileged access to all SNVS registers in case of no TEE is
available.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Change-Id: I44686a3639a68c72c7eacc80691c294d5c32c9ae
diff --git a/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c b/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c
index 147249e..9117cf0 100644
--- a/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c
+++ b/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c
@@ -27,6 +27,7 @@
 #include <imx8m_caam.h>
 #include <imx8m_ccm.h>
 #include <imx8m_csu.h>
+#include <imx8m_snvs.h>
 #include <platform_def.h>
 #include <plat_imx8.h>
 
@@ -184,6 +185,10 @@
 #endif
 #endif
 
+#if !defined(SPD_opteed) && !defined(SPD_trusty)
+	enable_snvs_privileged_access();
+#endif
+
 	bl31_tzc380_setup();
 }