linux-image v4.4.0-93.116 requires linux-fimrware v1.157.11 to make intel BT work

[AceLan Kao]

Hi,

We got a bug report from our customer that BT fails to work after user
upgrades the kernel.
The error message is BT can't find its firmware
   bluetooth hci0: Direct firmware load for intel/ibt-12-16.sfi failed
with error -2

After checking the kernel code and found this commit, it changes the
firmware filename abi number from 11 to ver.hw_variant and
ver.hw_variant is equal to 12.

commit 8f407efdd8c81240fd95847c43ec901ff595764c
Author: Tedd Ho-Jeong An <tedd.an at intel.com>
Date: Tue Jul 25 13:57:44 2017 +0800

    Bluetooth: Replace constant hw_variant from Intel Bluetooth
firmware filename

And the ABI 12 firmware was introduced after linux-firmware v1.157.11
by below commit.

commit 920c006162714217f4f5ce2a740e295ecb53e64b
Author: Tedd Ho-Jeong An <tedd.an at intel.com>
Date:   Wed Jul 6 11:44:56 2016 -0700

   linux-firmware: Fix the filename for WsP to align with device HW_VARIANT

To prevent this kind of issue from happening, I'm wondering could we
make linux-image v4.4.0-93.116+ dependent on linux-fimrware v1.157.11+
Thanks.

Best regards,
AceLan Kao.