Revert "rsl: Introduce new osmocom extension IE RSL_IE_OSMO_ABS_FRAME_NUMBER"

This reverts commit 54b1b3be37ae863ddbdd2b9408ebdd98ac8470d8.

osmo-bts is forwarding the msgbs as they come from lapdm to the RSL on
the wire, which means we end up sending the osmocom-specific IEs on the
wire, something which was not envisioned when adding this IE.

Change-Id: Id9029ef378970322063478e9ce888daf335d6103
Related: OS#6142
diff --git a/include/osmocom/gsm/protocol/gsm_08_58.h b/include/osmocom/gsm/protocol/gsm_08_58.h
index ec9ebe7..0a44db9 100644
--- a/include/osmocom/gsm/protocol/gsm_08_58.h
+++ b/include/osmocom/gsm/protocol/gsm_08_58.h
@@ -369,7 +369,6 @@
 	RSL_IE_OSMO_TRAINING_SEQUENCE	= 0x61,
 	RSL_IE_OSMO_TEMP_OVP_ACCH_CAP	= 0x62,
 	RSL_IE_OSMO_OSMUX_CID		= 0x63,
-	RSL_IE_OSMO_ABS_FRAME_NUMBER	= 0x64, /* uint32_t fn in network byte order */
 
 	/* ip.access */
 	RSL_IE_IPAC_SRTP_CONFIG	= 0xe0,
diff --git a/src/gsm/rsl.c b/src/gsm/rsl.c
index 53eb983..fbba982 100644
--- a/src/gsm/rsl.c
+++ b/src/gsm/rsl.c
@@ -126,7 +126,6 @@
 		[RSL_IE_OSMO_TRAINING_SEQUENCE]	= { TLV_TYPE_TLV },
 		[RSL_IE_OSMO_TEMP_OVP_ACCH_CAP]	= { TLV_TYPE_TLV },
 		[RSL_IE_OSMO_OSMUX_CID]		= { TLV_TYPE_TLV },
-		[RSL_IE_OSMO_ABS_FRAME_NUMBER]	= { TLV_TYPE_TLV }, /* uint32_t fn in network byte order */
 		[RSL_IE_IPAC_SRTP_CONFIG]	= { TLV_TYPE_TLV },
 		[RSL_IE_IPAC_PROXY_UDP]		= { TLV_TYPE_FIXED, 2 },
 		[RSL_IE_IPAC_BSCMPL_TOUT]	= { TLV_TYPE_TV },