openbsc: Upgrade to version v0.12.0 of OpenBSC

This has split out the GPRS library and some bugfixes.
diff --git a/recipes-osmocom/openbsc/openbsc_git.bb b/recipes-osmocom/openbsc/openbsc_git.bb
index f0c77df..e661f9c 100644
--- a/recipes-osmocom/openbsc/openbsc_git.bb
+++ b/recipes-osmocom/openbsc/openbsc_git.bb
@@ -1,9 +1,9 @@
 require ${PN}.inc
 
-PV = "0.10.1+gitr${SRCPV}"
+PV = "0.12.0+gitr${SRCPV}"
 PR = "${INC_PR}.1"
 
-SRCREV = "09db1a44bc56e81780954555acfbc1bf2fb7cc81"
+SRCREV = "019f913ca383bda9256e273c06327041b1761330"
 SRC_URI += "git://git.osmocom.org/openbsc.git;protocol=git"
 
 S = "${WORKDIR}/git/openbsc"