Move DFX memory mapped regions to the `mem_dict`

[mariodruiz]

Work done in this PR

• Include bram controller in the ip_dict I think it would be nice if the bram controller is included in the ip_dict so the read and write methods from DefaultIP can be used directly.
• Move DFX memory mapped regions to the mem_dict This goes hand in hand with #1352

This fix Xilinx/PYNQ-DEV#361

[codecov-commenter]

Codecov Report

Merging #1331 (85477d1) into image_v2.8 (b85f453) will decrease coverage by 0.04%. The diff coverage is 0.00%.

@@              Coverage Diff               @@
##           image_v2.8    #1331      +/-   ##
==============================================
- Coverage       46.47%   46.43%   -0.05%     
==============================================
  Files              28       28              
  Lines            4953     4962       +9     
  Branches          971      974       +3     
==============================================
+ Hits             2302     2304       +2     
- Misses           2594     2601       +7     
  Partials           57       57              

Impacted Files	Coverage Δ
pynq/overlay.py	33.63% <ø> (ø)
pynq/pl_server/embedded_device.py	0.00% <0.00%> (ø)
pynq/pl_server/hwh_parser.py	17.24% <0.00%> (-0.41%)	:arrow_down:
pynq/ps.py	100.00% <0.00%> (ø)
pynq/pl_server/xrt_device.py	29.36% <0.00%> (+0.18%)	:arrow_up:

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[mariodruiz]

Move this to draft until we have a better solution for the AXI4-Lite interfaces on partial regions

[mariodruiz]

TODO: test with HDL module in IPI