Notify CellLocation whenever ACTION_USER_SWITCHED

Notify device's cell location when ACTION_USER_SWITCHED even though no
changes.
And 1st arg of notifyCellLocationForSubscriber() shall be subId instead.

Bug: 177495399
Test: atest TelephonyRegistryTest

Signed-off-by: Taesu Lee <taesu82.lee@samsung.com>
Change-Id: I6761c4bb500da1748119f9917663dae0307ab437
(cherry picked from commit 4619a6dbb9ea8909e35498f9076e36afb4c207ea)