test_sleep: replacing depreciated APIs with new one.

As part of Zephyr Release 1.9 some APIs will be depreciated.
This patch replaces APIs related to semophore init, kernel sleep,
task spawn etc.

Jira: ZEP-2009

Change-Id: I1fe09e9592f503c3413d51857fd740703173c042
Signed-off-by: Youvedeep Singh <youvedeep.singh@intel.com>