Yocto 3.3.1 update

Long time no update!
Just a small update, nothing fancy. Updated Yocto to 3.3.1, and added a command to enable USB audio. That is untested as I really don't know how to check if it works or not, but USB side it reports as enabled.

This release is a flashable package based on the following repos:

• Unlocked Bootloader (LK): https://github.com/Biktorgj/quectel_lk/releases
• Linux 3.18.140 Kernel: https://github.com/Biktorgj/quectel_eg25_kernel
• Forked meta-qcom layer: https://github.com/Biktorgj/meta-qcom/
• Yocto 3.3.1 based rootfs and recovery (https://www.yoctoproject.org/)
• Custom mobian kernel with patches to the modem codec driver (thanks @smaeul)
• Custom scripts to make it all work toghether

Before you begin

Please, take a minute to get a copy of the stock firmware here (https://github.com/Biktorgj/quectel_eg25_recovery), and carefully read the README. If you don't know understand what it says, or don't know how to recover the firmware in case something goes wrong, avoid touching your modem

CHANGES FROM PREVIOUS RELEASE

• Includes the sampling rate patches for the adventurous
• Initial USB audio support

Installation instructions:

1. Get required tools: you need adb and fastboot

2. Grab a copy of the firmware, and, optionally, a recovery firmware (https://github.com/Biktorgj/quectel_eg25_recovery)

3. Run the flashall script bundled in the package. If something fails, flash manually

4. After you flashed everything, you can run 'fastboot reboot' (you might have to do that twice) and wait for it to come back.

Have fun!