[FIX] Reduce simulator resource utilization of memory model

Large memory models need quite much resources if described with signals.
Therefore a variable is used instead.

Change-Id: Ib36ca0bbca3583967affc0e29670d55aaa98efbc
[FEATURE] Add axi lite master and slave wrappers

Add AXI lite slave and master wrapper implementation independent of any
hardware platform. The wrapper converts AXI lite to Avalon protocol transfers.

Change-Id: Ia3ecb10dc091881166934d644cd18e386f8175c9
[FEATURE] Add axi host interface toplevel

The axi host interface toplevel applies the axi wrappers to convert
the master and slave interfaces to axi lite.

Change-Id: Ib822a776efc1600cc0edc12e09abf69597ff87fd
[FEATURE] Add axi host interface XPS pcore

- Add pcores support for XPS
- Add HW/SW interface TCL script generating parameters in xparameters.h

Change-Id: I0ac26685820ba8aa7f173ef1a035f55ca284f8ed
[TASK] Update host interface release script

Change-Id: I04f00fb145ad533b0e865b9d2559b94d715f9805
[FEATURE] Add waveform documentation to axiwrappers

Add wavedrom files for master/slave writes and reads.

Change-Id: I832802d9d32a6b3a9584a14d61de78ef7f63f837