update libosmocore_git to 8ec7f901bb1843b7c29335d5ea0531e7a1527210

this includes a fix for the nasty missing "logging filter" while writing the
config bug.
diff --git a/recipes-osmocom/libosmocore/libosmocore_git.bb b/recipes-osmocom/libosmocore/libosmocore_git.bb
index 35e6eb3..3392d2b 100644
--- a/recipes-osmocom/libosmocore/libosmocore_git.bb
+++ b/recipes-osmocom/libosmocore/libosmocore_git.bb
@@ -1,7 +1,7 @@
 require ${PN}.inc
 
 S = "${WORKDIR}/git"
-SRCREV = "b8d18f32a1676f05d73bc9d94eadeaf5cc43c9a5"
+SRCREV = "8ec7f901bb1843b7c29335d5ea0531e7a1527210"
 SRC_URI = "git://git.osmocom.org/libosmocore.git;protocol=git"
 PV = "0.5.3+gitr${SRCPV}"
 PR = "0"