busybox: arc: Disable monotonic syscall

For some reasons "monotonic" timer system call fails on arc. As a workaround we
disable use of this system call in the busybox configuration.

Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com>
arc: Add defconfig for ARC 700

Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com>
arc: Add busybox config

Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com>
arc: Add a custom overlay

Add an overlay that does many nice things:
1. Includes touch screen calibration
2. Configures input for Qt
3. Configures inetd to accept connectiosn for ftpd & telnetd
4. Configures eth0 for nSIM SystemC model
5. Mounts NFS share on host
6. Reconfigures inittab, to avoid getty
7. Configures DNS servers

Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com>
arc: Enable telnetd and ftpd

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