Added slot index in area info broadcast

Added slot index information in the broadcast
so the receiver knows which slot to get information.

Test: Manual
Merged-In: Icd1bcc2fa905bae6b0f2220e9a27178711bac0c7
Change-Id: Icd1bcc2fa905bae6b0f2220e9a27178711bac0c7
Fix: 150126754
(cherry picked from commit 5a4dabcb)