libosmocore: Build a 0.5.3+ version and force rebuild

The behavior of the OSMO_MIN/OSMO_MAX has been fixed. Update
the library and force the rebuild.
diff --git a/conf/layer.conf b/conf/layer.conf
index f428ace..11f7089 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 = "5"
+META_TELEPHONY_OSMO_INC = "6"
diff --git a/recipes-osmocom/libosmocore/libosmocore_git.bb b/recipes-osmocom/libosmocore/libosmocore_git.bb
index 9ed5a16..1b96f39 100644
--- a/recipes-osmocom/libosmocore/libosmocore_git.bb
+++ b/recipes-osmocom/libosmocore/libosmocore_git.bb
@@ -1,7 +1,7 @@
 require ${PN}.inc
 
 S = "${WORKDIR}/git"
-SRCREV = "aa5d0e88944fe3258260aedfbce9101301e35b44"
+SRCREV = "08b286277b1d1c16ce3a615c5de07cefcbd6acf6"
 SRC_URI = "git://git.osmocom.org/libosmocore.git;protocol=git"
-PV = "0.5.2+gitr${SRCPV}"
+PV = "0.5.3+gitr${SRCPV}"
 PR = "0"