[FEATURE] Add MN parallel interface design on AVNET S6 PLK board

- Add XPS design for Pcp and host processor for AVNET S6 PLK boards
  connected via parallel interface
- Add software developmemt support files like linker scripts and mss
  files for Pcp and host processor

Change-Id: I7212a752f32e9f601eca096578c63d7cb8b651ca
[FEATURE] Add MN dual Microblaze design on AVNET LX150T board

- Add XPS design for Pcp and host processor for AVNET LX150T board
  connected internally
- Add software developmemt support files like linker scripts and mss
  files for Pcp and host processor

Change-Id: I659090d89bebca5b87edf9c8d056d863e56adc8f
[TASK] Add phyconfig for AVNET LX150T board with FMC card

This files is needed for board specific phy configuration.

Change-Id: Ibd89f314545e88767e4860aeb6fe4316c56562b1