tests: Rename uasyncio to asyncio.

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

tests/extmod/asyncio_get_event_loop.py

@@ -0,0 +1,17 @@
+# Test get_event_loop()
+
+try:
+    import asyncio
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
+
+async def main():
+    print("start")
+    await asyncio.sleep(0.01)
+    print("end")
+
+
+loop = asyncio.get_event_loop()
+loop.run_until_complete(main())