cdp: added support for Min-Requested-Bandwidth-[DU]L AVPs

From 3GPP TS 29.214 version 10.6.0 Release 10:

> 5.3.31 Min-Requested-Bandwidth-DL AVP
> The Min-Requested-Bandwidth-DL AVP (AVP code 534) is of type Unsigned32, and it indicates the minimum
> requested bandwidth in bits per second for a downlink IP flow. The bandwidth contains all the overhead coming from
> the IP-layer and the layers above, e.g. IP, TCP, UDP, HTTP, RTP and RTP payload.
> When provided in an AA-Request, it indicates the minimum requested bandwidth.
>
> 5.3.32 Min-Requested-Bandwidth-UL AVP
> The Min-Requested-Bandwidth-UL AVP (AVP code 535) is of type Unsigned32, and it indicates the minimum
> requested bandwidth in bits per second for an uplink IP flow. The bandwidth contains all the overhead coming from the
> IP-layer and the layers above, e.g. IP, TCP, UDP, HTTP, RTP and RTP payload.
> When provided in an AA-Request, it indicates the minimum requested bandwidth.

src/modules/cdp/diameter_epc_code_avp.h

@@ -112,6 +112,8 @@ enum
 	AVP_EPC_Service_URN = 525,
 	AVP_EPC_Acceptable_Service_Info = 526,
 	AVP_EPC_Service_Info_Status = 527,
+	AVP_EPC_Min_Requested_Bandwidth_DL = 534,
+	AVP_EPC_Min_Requested_Bandwidth_UL = 535,
 	/** 600 to 699 reserved for TS29.229											*/
 	/** 700 to 799 reserved for TS29.329											*/