ar71xx: add ath10k packages for OpenMesh A40/A60 (#1444)

The dependency line was lost during the rebase of the current master
version.

Fixes: 9d719a2e ("ar71xx: add support for OpenMesh A40/A60 (#1424)")

targets/ar71xx-generic

@@ -125,6 +125,7 @@ device onion-omega onion-omega
 
 device openmesh-a60 a60 A60
 alias openmesh-a40
+packages $ATH10K_PACKAGES
 
 device openmesh-mr1750 mr1750 MR1750
 alias openmesh-mr1750v2