Increase waiting state timeout from 30s to 5min.

Test: runtest --path
frameworks/opt/telephony/tests/telephonytests/src/com/android/
internal/telephony/gsm/GsmInboundSmsHandlerTest.java
Bug: 68704659
Bug: 69475609

Change-Id: I79bded1ca345978075836bf247fccb53bc55caa5
(cherry picked from commit 8907a6dc)