config-linux: Add restriction for duplicated device path
config-linux: Add restriction for duplicated device path

I think runtime should generate an error, if devices has
duplicated device path.
Because we don't know which one is really needed.

Signed-off-by: Ma Shimiao <4511f16e942ad3568742865d09c9060c1d8bebb9@cn.fujitsu.com>

hqhq/runtime-spec,hqhq/specs,opencontainers/runtime-spec,opencontainers/specs,laijs/specs,wking/opencontainer-specs,wking/opencontainer-runtime-spec