Floss: Allow fallback to CVSD S1 from CVSD S3 or S4

According to HFP 1.9 spec 6.7.1.2, AG should retry S1 as a
'safe setting' when the previous setup was rejected.

This patch is needed for the below tests
HFP/AG/ACC/BV-22-C
HFP/AG/ACC/BV-23-C

Bug: 324157546
Bug: 332650199
Test: Run above qualification tests
Test: m -j
Tag: #floss

Change-Id: If57eb871cd08616807a346fab0a51cb910425dc5