ARC: add configs for AXS101 board with both arc-3.13 and arc-3.15 kernels

The most important reason to have arc-3.15 kernel is support of USB 1.1
peripherals which is missing in arc-3.13.

Also in arc-3.15 build perf is disabled because it requires NPTL support in
uClibc which is not there yet.

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