Added cell broadcast debug message into bugreport

Added local log for cell broadcast related debug messages.

Bug: 79948348
Test: Manual
Merged-In: I94a77dd475e4e1861096e2e443b4e5a21b08ba26
Change-Id: I94a77dd475e4e1861096e2e443b4e5a21b08ba26
(cherry picked from commit c37570e5)