Intoduce Packet Switch CGI

This structure is needed in order to identify a given cell within the
BSS during RIM transactions.
The naming was made up by myself since I couldn't find any naming
reference for this kind of data (RAI + CI).
Since LAI + CI = CGI, then RAI + CI = CGI-PS

osmo_rai_name2 family of functions get a "2" suffix due to already
existing functions handling struct struct gprs_ra_id in gsm48.h

Change-Id: If48f412c32e8e5a3e604a78d12b74787a4786374
diff --git a/include/osmocom/gsm/gsm0808_utils.h b/include/osmocom/gsm/gsm0808_utils.h
index 59db6ed..76e9064 100644
--- a/include/osmocom/gsm/gsm0808_utils.h
+++ b/include/osmocom/gsm/gsm0808_utils.h
@@ -44,6 +44,7 @@
 	uint16_t				ci;
 	struct osmo_location_area_id		lai_and_lac;
 	uint16_t				lac;
+	struct osmo_cell_global_id_ps		global_ps;
 };
 
 /*! Parsed representation of Cell Identifier IE (3GPP TS 48.008 3.2.2.17) */