Switch to nsimdrv instead of nsim_gdb

Nsim_gdb is an obsolete application, nsimdrv is a new alternative.

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>
(cherry picked from commit 5484615ca6c1b009b5d2ba65a505118e204fdb32)
Add DejaGNU board file for Metaware+nSIM

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>