Fix introducing osmocom speficic OML attributes

Rename NM_ATT_O_REDUCEPOWER to NM_ATT_OSMO_REDUCEPOWER, which
makes it more clear that this is an osmcoom specific attribute.

Also, we cannot simply overload 0x01 as an already defined OML
attribute.  The problem is quite simple: When we use abis_nm_att_tlvdef
during the TLV parse, 0x01 will match to NM_ATT_ABIS_CHANNEL,
which is defined as { TLV_TYPE_FIXED, 3 }.

So instead, we need to introduce a new abis_nm_osmo_att_tlvdef[],
which has to be patched into abis_nm_att_tlvdef[] by the means of
tlv_def_patch(), exactly how we do it for bs-11 and nanobts specific
attributes.

I'm using 0xfe for the attribute, as 0xfe doesn't overlap with the IPA
specific attribues (and we might want to combine/merge the 12.21 plus
IPA plus osmocom spefici attributes)

include/osmocom/gsm/protocol/gsm_12_21.h

@@ -487,7 +487,9 @@ enum abis_nm_attr {
 	NM_ATT_BS11_PLL_MODE		= 0xfc,
 	NM_ATT_BS11_PASSWORD		= 0xfd,
 
-	NM_ATT_O_REDUCEPOWER		= 0x01,
+	/* osmocom (osmo-bts) specific attributes, used in combination
+	 * with the "org.osmocom" manufacturer identification */
+	NM_ATT_OSMO_REDUCEPOWER		= 0xfe,	/* TLV_TYPE_TV */
 };
 #define NM_ATT_BS11_FILE_DATA	NM_ATT_EVENT_TYPE
 

src/gsm/abis_nm.c

@@ -323,6 +323,13 @@ const struct tlv_definition abis_nm_att_tlvdef = {
 	},
 };
 
+/*! \brief org.osmocom GSM A-bis OML TLV parser definition */
+const struct tlv_definition abis_nm_osmo_att_tlvdef = {
+	.def = {
+		[NM_ATT_OSMO_REDUCEPOWER] =	{ TLV_TYPE_TV },
+	},
+};
+
 /*! \brief Human-readable strings for A-bis OML Object Class */
 const struct value_string abis_nm_obj_class_names[] = {
 	{ NM_OC_SITE_MANAGER,	"SITE-MANAGER" },

src/gsm/libosmogsm.map

@@ -10,6 +10,7 @@ abis_nm_event_type_name;
 abis_nm_nack_cause_name;
 abis_nm_nack_name;
 abis_nm_att_tlvdef;
+abis_nm_osmo_att_tlvdef;
 abis_nm_obj_class_names;
 abis_nm_opstate_name;
 abis_nm_nacks;