broadcaster: Handle suspend/resume request before controller setup

This change allows to not interrupt processing controller setup in case
if suspend callback and then resume would be called.

Bug: 358587027
Bug: 360435489
Test: atest --host bluetooth_test_broadcaster_state_machine
Test: manual test start/stop/enable/disable broadcast
Flag: TEST_ONLY
Change-Id: I3283145b0abe4006bb88aeed4e4a7d9b32c5ee00