Cleanup of systemd service files

Let's use a symlink in debian/ as we do in other projects,
and merge the two service files since anyway they call the same binary.

Change-Id: Ibd82ec12cbeb73a27ca5860266587efb58be14ab
diff --git a/contrib/osmo-pcu.service b/contrib/osmo-pcu.service
index 3066a66..6329d31 100644
--- a/contrib/osmo-pcu.service
+++ b/contrib/osmo-pcu.service
@@ -1,5 +1,5 @@
 [Unit]
-Description=sysmocom sysmoPCU
+Description=Osmocom osmo-pcu
 
 [Service]
 Type=simple
@@ -14,4 +14,3 @@
 
 [Install]
 WantedBy=multi-user.target
-Alias=sysmopcu.service
diff --git a/contrib/sysmopcu.service b/contrib/sysmopcu.service
deleted file mode 100644
index df8c47e..0000000
--- a/contrib/sysmopcu.service
+++ /dev/null
@@ -1,17 +0,0 @@
-[Unit]
-Description=sysmocom sysmoPCU
-
-[Service]
-Type=simple
-ExecStart=/usr/bin/osmo-pcu -c /etc/osmocom/osmo-pcu.cfg
-Restart=always
-RestartSec=2
-RestartPreventExitStatus=1
-
-# The msg queues must be read fast enough
-CPUSchedulingPolicy=rr
-CPUSchedulingPriority=1
-
-[Install]
-WantedBy=multi-user.target
-Alias=osmo-pcu.service
diff --git a/debian/osmo-pcu.service b/debian/osmo-pcu.service
deleted file mode 100644
index 850a715..0000000
--- a/debian/osmo-pcu.service
+++ /dev/null
@@ -1,15 +0,0 @@
-[Unit]
-Description=Osmocom osmo-pcu
-
-[Service]
-Type=simple
-ExecStart=/usr/bin/osmo-pcu -c /etc/osmocom/osmo-pcu.cfg
-Restart=always
-RestartSec=2
-
-# Read quickly enough
-CPUSchedulingPolicy=rr
-CPUSchedulingPriority=1
-
-[Install]
-WantedBy=multi-user.target
diff --git a/debian/osmo-pcu.service b/debian/osmo-pcu.service
new file mode 120000
index 0000000..f077431
--- /dev/null
+++ b/debian/osmo-pcu.service
@@ -0,0 +1 @@
+../contrib/osmo-pcu.service
\ No newline at end of file