select_best_cipher(): Prefer A5/1 over A5/2

We cannot simply use the highest 'x' in A5/x codecs.

For A5/7 through A5/3, larger 'x' means better.
But: A5/1 is better than A5/2, so we need to prefer the former
over the latter.

Change-Id: I399fff8d07d1bfcbc6b385e90914ff6d9e00eb73
Closes: OS#4975
1 file changed