sysmocom-udhcpd-config: start the udhcpd on the sysmocom-bsc only when eth1 is present

* the change affects the config file, so the package number
  is bumped

Related: SYS#735

recipes-apps/sysmocom-udhcpd-config/files/sysmocom-bsc/udhcpd.service

@@ -1,5 +1,7 @@
 [Unit]
 Description=UDHCPD
+Requires=sys-subsystem-net-devices-eth1.device
+After=sys-subsystem-net-devices-eth1.device
 
 [Service]
 Type=simple

recipes-apps/sysmocom-udhcpd-config/sysmocom-udhcpd-config_2.bb

@@ -6,7 +6,7 @@ LIC_FILES_CHKSUM = " \
 SRC_URI = "file://udhcpd.conf \
            file://udhcpd.service \
           "
-PR = "r5"
+PR = "r0"
 
 CONFFILES_${PN} = "${sysconfdir}/udhcpd.conf"
 FILES_${PN} += "${systemd_unitdir}"