nsimosci_hs: add defconfig for nSIM OSCI virtual platform for ARC HS

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
qt: add support for ARC architecture

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
DON'T MERGE: Add eth0 setup in default skeleton

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
gdb: switch from 4.8-R3 release to arc-7.5-dev branch

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>