gsm: Introduce osmo_{rai,cgi_ps}_cmp() APIs

Similar to what we already have for other data types, such as
osmo_lai_cmp or osmo_cgi_cmp.

Change-Id: I00e329bc5be8674b30267dec238e7656ddfc21db
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index de9a595..c314c20 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -410,6 +410,7 @@
 osmo_lai_name;
 osmo_lai_name_buf;
 osmo_lai_name_c;
+osmo_rai_cmp;
 osmo_rai_name;
 osmo_rai_name_buf;
 osmo_rai_name_c;
@@ -421,6 +422,7 @@
 osmo_cgi_name_buf;
 osmo_cgi_name_c;
 osmo_cgi_name2;
+osmo_cgi_ps_cmp;
 osmo_cgi_ps_name;
 osmo_cgi_ps_name_buf;
 osmo_cgi_ps_name_c;