drivers/display: Don't include tests by default.

The tests can be copied to the board if needed.

Also update the docs to reflect this change.
Signed-off-by: Damien George <damien@micropython.org>

docs/pyboard/tutorial/lcd160cr_skin.rst

@@ -40,9 +40,9 @@ Testing the display
 
 There is a test program which you can use to test the features of the display,
 and which also serves as a basis to start creating your own code that uses the
-LCD.  This test program is included in recent versions of the pyboard firmware
-and is also available on GitHub
+LCD.  This test program is available on GitHub
 `here <https://github.com/micropython/micropython/blob/master/drivers/display/lcd160cr_test.py>`__.
+Copy it to the board over USB mass storage, or by using `mpremote`.
 
 To run the test from the MicroPython prompt do::
 

docs/reference/mpremote.rst

+.. _mpremote:
+
 MicroPython remote control: mpremote
 ====================================
 

drivers/display/manifest.py

 # TODO: Split these into separate directories with their own manifests.
-options.defaults(lcd160cr=False, ssd1306=False, test=True)
+options.defaults(lcd160cr=False, ssd1306=False, test=False)
 
 if options.lcd160cr:
     module("lcd160cr.py", opt=3)