Global structure macro rename

[mnaguban]

Problem solved by the commit

Total 3 commits:- i)-> Added global platform structures for both USERPF & MGMTPF for all subdev files. ii)-> Macro names added to subdev/ device files to differentiate between userpf and mgmtpf functions. iii)-> To separate userpf & mgmtpf modules, we used one flag instead of macro in the xocl_fdt blob functions.

Bug / issue (if any) fixed, which PR introduced the bug, how it was discovered

How problem was solved, alternative solutions (if any) and why they were rejected

Risks (if any) associated the changes in the commit

What has been tested and how, request additional testing if necessary

Documentation impact (if any)