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Use btattach instead of hciattach

hciattach has been deprecated ([1] and [2]) and btattach seems to be the replacement.

Using btattach instead of hciattach on the Librem5 doesn't seem to work though.

I have tried the following, but none of these seem to work

btattach --speed 1500000 -N -B /dev/ttymxc3 --protocol bcm
btattach --speed 1500000 -B /dev/ttymxc3 --protocol bcm
btattach --speed 115200 -B /dev/ttymxc3 --protocol bcm

The bluez-deprecated packages will eventually be removed, so we should start to think about migrating from hciattach to btattach.

1: https://fedoraproject.org/wiki/Changes/BluetoothDeprecated 2: https://www.spinics.net/lists/linux-bluetooth/msg70489.html

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