change(micropython): Create weak link from `(u)module` to `module`

Create weak links from MicroPython specific implementations of modules to standard names. I.e. allow import time to import utime module.

Documentation/pycardium/bhi160.rst

@@ -28,18 +28,18 @@ The coordinate system of the BHI160 sensor data looks like this:
 .. code-block:: python
 
    import bhi160
-   import utime
+   import time
 
    bhi = bhi160.BHI160Orientation()
 
     while True:
         samples = bhi.read()
         if len(samples) == 0:
-            utime.sleep(0.25)
+            time.sleep(0.25)
             continue
         # print the latest sample
         print(samples[-1])
-        utime.sleep(0.25)
+        time.sleep(0.25)
 
 
 Orientation