Update Osmocom recipes to latest tags (release 202102)

Change-Id: I1134998ca9d20c5f204b4770fa6bf18497a54402
diff --git a/recipes-osmocom/osmo-mgw/osmo-mgw_git.bb b/recipes-osmocom/osmo-mgw/osmo-mgw_git.bb
index 14dd5c1..528295b 100644
--- a/recipes-osmocom/osmo-mgw/osmo-mgw_git.bb
+++ b/recipes-osmocom/osmo-mgw/osmo-mgw_git.bb
@@ -1,7 +1,7 @@
 require ${PN}.inc
 
 S = "${WORKDIR}/git"
-SRCREV = "ec45068972b85c6ace5483c5f533dae8e7975d41"
-SRC_URI = "git://git.osmocom.org/osmo-mgw.git;protocol=git"
-PV = "1.7.0+gitr${SRCPV}"
+SRCREV = "1.8.1"
+SRC_URI = "git://git.osmocom.org/osmo-mgw.git;protocol=git;tag=${SRCREV};nobranch=1"
+PV = "1.8.1+gitr${SRCPV}"
 PR = "${INC_PR}.0"