Fix: Display full text in "Switch to mic" notification

Root Cause: The default notification style did not have enough space to show full notification text,
so it will get truncated.

Solution: Use BigTextStyle to display more text

Bug: 393968576
Test: manual testing if expand notification will truncate the message
Flag: EXEMPT bugfix
Change-Id: I5dc37627b44ff299b25dba86eccd29e928bc4b78
1 file changed