arc: select NANOKERNEL_TICKLESS_IDLE_SUPPORTED

The ARC is an architecture that supports tickless idle in
nanokernel-only systems, and it thus must signal this to the build
system.

Change-Id: I96b0a4e8f78b2ea67d2f1b3384e94a32d8eb80e8
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
1 file changed