pine64 bluetooth firmware config file missing

[eminguez]

After a fresh armbian installation + armbian-firmware-full package, the pine64 bluetooth doesn't work because the rtl8723bs_config-pine64.bin file is missing.
I've downloaded the file from https://github.com/anarsoul/rtl8723bt-firmware/tree/master/rtl_bt into /lib/firmware/rtl_bt and it works so I've created a PR here https://github.com/armbian/firmware/pull/14 to add it to the firmware package so it can work out of the box.

Let me know if I need to do something else for the PR to be merged.

Thanks.