broadcaster: Handle suspend request before controller setup

This change allows to cleanup BIG if suspend was requested before
setting up controller (broadcast state STREAMING).

Bug: 358587027
Bug: 360435489
Test: atest --host bluetooth_test_broadcaster bluetooth_test_broadcaster_state_machine
Flag: TEST_ONLY
Change-Id: Iace9f7fed8223f40ea97ceb14c371ca9afd3e7b8