pdch: Log TS enable/disable transitions

Change-Id: I6780634de4791382ccd25bf7b74f5286420e2c52
diff --git a/src/pdch.cpp b/src/pdch.cpp
index 8e70ffc..c1c7714 100644
--- a/src/pdch.cpp
+++ b/src/pdch.cpp
@@ -143,6 +143,7 @@
 
 void gprs_rlcmac_pdch::enable()
 {
+	LOGPDCH(this, DRLCMAC, LOGL_INFO, "PDCH state: %s => enabled\n", m_is_enabled ? "enabled" : "disabled");
 	OSMO_ASSERT(m_is_enabled == 0);
 	INIT_LLIST_HEAD(&paging_list);
 
@@ -155,6 +156,7 @@
 
 void gprs_rlcmac_pdch::disable()
 {
+	LOGPDCH(this, DRLCMAC, LOGL_INFO, "PDCH state: %s => disabled\n", m_is_enabled ? "enabled" : "disabled");
 	OSMO_ASSERT(m_is_enabled == 1);
 	this->free_resources();