tests: Move native for test from pybnative to micropython.

And make it generic so it can be run on any target.

Signed-off-by: Damien George <damien@micropython.org>

tests/micropython/native_for.py

@@ -0,0 +1,19 @@
+# test for native for loops
+
+
+@micropython.native
+def f1(n):
+    for i in range(n):
+        print(i)
+
+
+f1(4)
+
+
+@micropython.native
+def f2(r):
+    for i in r:
+        print(i)
+
+
+f2(range(4))