leaudio: Fix issue with not moving to Streaming state

When STREAMING state was received before CIS data path is established,
the group was not moving to Streaming state which lead to watchdog
timeout.

Bug: 315222220
Test: atest bluetooth_le_audio_test
Tag: #feature
Change-Id: I1a5e08c34f5913788c8e847fd165765e25275b3a