[Update] Update path to syn_top in entry.tcl

[DouglasGroen]

Description

Remove the hard-coding of the syn_top path in entry.tcl to prevent a change in the FIM hierarchy breaking the ASP's build/compilation flow. This change will detect the relative path to the syn_top folder and write it into a variable in a tcl file from setup-bsp.py, which is then sourced in entry.tcl and used to find the Quartus build location.

Collateral (docs, reports, design examples, case IDs):

None.

• [ ] Document Update Required? (Specify FIM/AFU/Scripts)

Tests added:

Tests run:

Compiled N6001 sample designs successfully.

[DouglasGroen]

Also compiled d5005 (usm and non-usm) designs successfully.