l1: Add debug log messages for I_LEVEL

The I_LEVEL values that are obtained now look suspicious. They do not
seem to be contained in messages recorded via gsmtab.

To help debugging this issue, this commit adds related debug messages
that are generated while the encoded values are taken from the
RLC/MAC messages.

Sponsored-by: On-Waves ehf
diff --git a/src/bts.cpp b/src/bts.cpp
index 5fafd84..7914cfd 100644
--- a/src/bts.cpp
+++ b/src/bts.cpp
@@ -819,8 +819,12 @@
 
 	for (i = 0; i < OSMO_MIN(ARRAY_SIZE(qr->Slot), ARRAY_SIZE(meas->ts)); i++)
 	{
-		if (qr->Slot[i].Exist)
+		if (qr->Slot[i].Exist) {
+			LOGP(DRLCMAC, LOGL_INFO,
+				"Packet resource request: i_level[%d] = %d\n",
+				i, qr->Slot[i].I_LEVEL);
 			meas->set_ms_i_level(i, -2 * qr->Slot[i].I_LEVEL);
+		}
 	}
 }
 
@@ -835,8 +839,12 @@
 
 	for (i = 0; i < OSMO_MIN(ARRAY_SIZE(qr->Slot), ARRAY_SIZE(meas->ts)); i++)
 	{
-		if (qr->Slot[i].Exist)
+		if (qr->Slot[i].Exist) {
+			LOGP(DRLCMAC, LOGL_INFO,
+				"Channel quality report: i_level[%d] = %d\n",
+				i, qr->Slot[i].I_LEVEL_TN);
 			meas->set_ms_i_level(i, -2 * qr->Slot[i].I_LEVEL_TN);
+		}
 	}
 }