Merge "gd hci: Check credit before sending next fragment" am: b051c7eb am:...

Merge "gd hci: Check credit before sending next fragment" am: b051c7eb am: 7e0a204c am: 4f8a2c03

Original change: https://android-review.googlesource.com/c/platform/system/bt/+/1669525

Change-Id: Ibbfa60e0112883e5b41c6d99e7e8342f98c879cd