Include driver for AXI4-Stream Switch with AXI4-Lite interface

[mariodruiz]

Fix Xilinx/PYNQ-Dev#67

[mariodruiz]

This PR needs to be merged first #1368

[codecov-commenter]

Codecov Report

Merging #1383 (c0d76a9) into image_v2.8 (ee9217e) will decrease coverage by 0.05%.
The diff coverage is 39.62%.

@@              Coverage Diff               @@
##           image_v2.8    #1383      +/-   ##
==============================================
- Coverage       45.35%   45.29%   -0.06%     
==============================================
  Files              29       30       +1     
  Lines            5137     5190      +53     
  Branches         1036     1048      +12     
==============================================
+ Hits             2330     2351      +21     
- Misses           2748     2780      +32     
  Partials           59       59              

Impacted Files	Coverage Δ
pynq/lib/axiswitch.py	38.46% <38.46%> (ø)
pynq/lib/__init__.py	100.00% <100.00%> (ø)

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