AMR defaults to bandwidth-efficient mode
0d9a1a7583842203cbbd60517a2c4d63247db954 introduced a new vty option to select between bandwidth efficient and octet-aligned mode.
Previously it would basically always be octet align since that's what all the BTS use natively, but now, with this option the default has changed which can break existing setup that are not aware of this.
Make sure to default to AMR octet-aligned mode
In Change-Id If6d40b2407b87aad2227ea7f15533ef01a3771b3 we introduced
the support for both octet-aligned and bandwidth-efficient mode, and
added a related VTY option about it.
However, we accidentially also changed the default behavior. Without
any explicit configuration, we should behave just like we behaved all
those years before: Continue with octet-aligned mode.