Set BT SCO devices only after obtaining 'bt-sco-ready' from routing option

Set BT SCO devices only after obtaining 'bt-sco-ready' from routing option

In this target, there are several UCM BT SCO devices depending on its bandwidth
and network bandwidth. To work well, BT bandwidth should be got right after
BT SCO is ready. This patch makes it possible to set the BT SCO device properly
by keeping the call sequences with 'bt-sco-ready' and 'bt-wideband' options.

[Version] 0.1.7
[Profile] Wearable
[Issue Type] Enhancement

Change-Id: I079328c55e299acb7b9ea8b3dba0b42dfd95ca8b
Signed-off-by: Sangchul Lee <sc11.lee@samsung.com>