[Regression] Linux v5.10 breaks AR3011 fw loading

Hey everyone,

Linux v5.10 broke firmware loading for my AR3011 Bluetooth USB adapter.
A git bisect identified the following commit as the culprit:

commit b40f58b973865ee98ead884d2bdc7880b896ddb8
Author: Rocky Liao [off-list ref]
Date:   Tue Sep 29 12:23:51 2020 +0800

    Bluetooth: btusb: Add Qualcomm Bluetooth SoC WCN6855 support
  
    This patch add support for WCN6855 i.e. patch and nvm download
    support.

The accompanying patch describes the issue further and attempts to offer
a fix based on my superficial understanding, which may or may not be
adequate.

Regards,
Florian