bts: Drop specific functions to add values to counters

It's super annoying seeing lots of functions being called everywhere
only to find out they are only incrementing a counter. Let's drop all
those functions and increment the counter so people looking at code
doesn't see dozens of code paths evyerwhere.

Most of the commit was generated by following sh snippet:
"""
 #!/bin/bash
define_pattern="^CREATE_COUNT_ADD_INLINE"
generic_func="do_rate_ctr_add"
grep -r -l "${define_pattern}" . | xargs cat | grep "${define_pattern}("| tr -d ",;" | tr "()" " " | awk '{ print $2 " " $3 }' >/tmp/hello

while read -r func_name ctr_name
do
 #echo "$func_name -> $ctr_name";
files="$(grep -r -l "${func_name}(" .)"
for f in $files; do
echo "$f: $func_name -> $ctr_name";
sed -i "s#${func_name}(#${generic_func}(${ctr_name}, #g" $f
done;
done < /tmp/hello

grep -r -l "void ${generic_func}" | xargs sed -i "/void ${generic_func}(CTR/d"
grep -r -l "$define_pattern" | xargs sed -i "/$define_pattern/d"
"""

Change-Id: I966221d6f9fb9bb4f6068bf45ca2978008a0efed
diff --git a/src/gprs_rlcmac_sched.cpp b/src/gprs_rlcmac_sched.cpp
index 6a53468..3db3365 100644
--- a/src/gprs_rlcmac_sched.cpp
+++ b/src/gprs_rlcmac_sched.cpp
@@ -444,7 +444,7 @@
 	if (!msg)
 		return -ENOMEM;
 	/* msg is now available */
-	bts->bts->rlc_dl_bytes(msg->data_len);
+	bts->bts->do_rate_ctr_add(CTR_RLC_DL_BYTES, msg->data_len);
 
 	/* set USF */
 	OSMO_ASSERT(msgb_length(msg) > 0);