nios2: convert altera sysid to driver model

Convert altera sysid to driver model with misc uclass.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Chin Liang See <clsee@altera.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/device-tree-bindings/misc/altera_sysid.txt b/doc/device-tree-bindings/misc/altera_sysid.txt
new file mode 100644
index 0000000..54462eb
--- /dev/null
+++ b/doc/device-tree-bindings/misc/altera_sysid.txt
@@ -0,0 +1,4 @@
+Altera sysid
+
+Required properties:
+- compatible : should be "altr,sysid-1.0"