tests: kernel: import libs test to unified kernel

This tests access to standard libraries. Adapted
to use ZTEST.

Jira: ZEP-932

Change-Id: I3564bfa61221b2456323c1018402237b6129b5ca
Signed-off-by: Jithu Joseph <jithu.joseph@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>