libosmocore/libosmo-abis: Upgrade to 0.6.6 and 0.2.0

Upgrade to versions 0.6.6 and 0.2.0. These change the SO
version of the libraries and provide stability and reliability
fixes.
diff --git a/conf/layer.conf b/conf/layer.conf
index 3490fd1..b143ff1 100644
--- a/conf/layer.conf
+++ b/conf/layer.conf
@@ -9,4 +9,4 @@
 BBFILE_PATTERN_telephony = "^${LAYERDIR}/"
 BBFILE_PRIORITY_telephony = "5"
 
-META_TELEPHONY_OSMO_INC = "11"
+META_TELEPHONY_OSMO_INC = "12"