arm: mach-imx: move snvs module

Commit 723f8359c1 ("imx: mx7: snvs: Add an SNVS init routine") noted
that the init_snvs() call likely applies to other i.MX processors, and
this has been found to be true for i.MX8MP.

Move snvs module for future re-use.

Signed-off-by: Ian Ray <ian.ray@gehealthcare.com>
diff --git a/arch/arm/mach-imx/snvs.h b/arch/arm/mach-imx/snvs.h
new file mode 100644
index 0000000..4ce9781
--- /dev/null
+++ b/arch/arm/mach-imx/snvs.h
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018 Linaro
+ */
+
+void init_snvs(void);