Add generic gdbserver GUI

Signed-off-by: Yunlu Zhang <Yunlu.Zhang@synopsys.com>

Undone part:

1:The default value for port/IP address
2:The proper behaivor for arc-elf32-gdb when using "Generic gdbserver"
Release COM port at the end of debugging

Signed-off-by: Yunlu Zhang <Yunlu.Zhang@synopsys.com>