[Power][Common] Calling "lockstate" instead "lockstate_nopt"

[Power][Common] Calling "lockstate" instead "lockstate_nopt"

Native API reverted its changes. Now we should call "lockstate" again.
With this change API can request DIM brightness again.

[Native changes]
https://review.tizen.org/gerrit/#/c/159981/
https://review.tizen.org/gerrit/#/c/159994/
https://review.tizen.org/gerrit/#/c/159993/
https://review.tizen.org/gerrit/#/c/159980/

[Verification] 100% pass rate on power manual and automatic tests

Change-Id: I2ec53da7d9f79d5f583603a0f75f3fd7ce35fb91
Signed-off-by: Michal Bistyga <m.bistyga@samsung.com>