The BT chip for the ccimx93 cannot be turned off, nor can it be re-uploaded.
Therefore, we need to set some conditions to assume that it is going to be
attached correctly. The changes in this script take care of that.
Upon the first attachment, the rate is set to 3M, and future uses will always
be done at this rate. If, for any reason, it was not stopped and the chip is
already attached, do nothing.
https://onedigi.atlassian.net/browse/DEL-8464
Signed-off-by: Isaac Hermida <isaac.hermida@digi.com>