firmware: eth: use a syscall to generate MAC. Ref T2089
firmware: eth: use a syscall to generate MAC. Ref T2089

This allows jtag runner to catch the syscall and read the fuse itself and avoid
conflicting accesses in debug over CNoC

Signed-off-by: Nicolas Morey-Chaisemartin <7188b998d7bb37a035517aa285fa3f5a95344e80@kalray.eu>

kalray/odp-mppa,kalray/odp-mppa,kalray/odp-mppa,kalray/odp-mppa,kalray/odp-mppa,kalray/odp-mppa,kalray/odp-mppa