fix(upf): remove gtp_ext_hdr.patch for N9 support (may break rfsimulator)

scripts/patches/gtp_ext_hdr.patch

---- a/src/plugins/upf/upf_gtpu_encap.c	2021-03-07 13:19:40.937167871 +0000
-+++ b/src/plugins/upf/upf_gtpu_encap.c	2021-03-07 15:27:03.082328061 +0000
-@@ -604,6 +604,7 @@
- 	  ip6_header_t *ip6_0;
- 	  udp_header_t *udp0;
- 	  gtpu_header_t *gtpu0;
-+	  gtpu_ext_header_t *gtpu0_ext;
- 	  u64 *copy_src0, *copy_dst0;
- 	  u32 *copy_src_last0, *copy_dst_last0;
- 	  u16 new_l0;
-@@ -636,6 +637,9 @@
- 	  next0 = peer0->next_dpo.dpoi_next_node;
- 	  vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
- 	    peer0->next_dpo.dpoi_index;
-+               
-+         upf_buffer_opaque (b0)->gtpu.ext_hdr_len = 0x08;
-+                   vlib_buffer_advance (b0, -upf_buffer_opaque (b0)->gtpu.ext_hdr_len);
- 
- 	  if (PREDICT_FALSE ((upf_buffer_opaque (b0)->gtpu.hdr_flags & GTPU_E_S_PN_BIT) != 0))
- 	    vlib_buffer_advance (b0, -upf_buffer_opaque (b0)->gtpu.ext_hdr_len);
-@@ -681,9 +685,19 @@
- 	      new_l0 =
- 		clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) -
- 				      sizeof (*ip4_0) - sizeof (*udp0) -
--				      GTPU_V1_HDR_LEN);
-+//				      GTPU_V1_HDR_LEN);
-+				      GTPU_V1_HDR_LEN + GTPU_V1_EXT_HDR_LEN);
- 	      gtpu0->length = new_l0;
--	      gtpu0->ver_flags |= (upf_buffer_opaque (b0)->gtpu.hdr_flags & GTPU_E_S_PN_BIT);
-+//	      gtpu0->ver_flags |= (upf_buffer_opaque (b0)->gtpu.hdr_flags & GTPU_E_S_PN_BIT);
-+              gtpu0->ver_flags = GTPU_EXT_HDR_PRESENT;
-+              gtpu0->pdu_number = 0x00;
-+              gtpu0->sequence = 0x00;
-+              gtpu0->next_ext_type = GTPU_EXT_HDR_PDU_SESSION_CONTAINER;
-+
-+              gtpu0_ext = (gtpu_ext_header_t *) (gtpu0 + 1);
-+              gtpu0_ext->type = 0x01;
-+              gtpu0_ext->len = 0x00;
-+              gtpu0_ext->pad = GTPU_QFI;
- 	    }
- 
- 	  else			/* ip6 path */
---- a/src/plugins/upf/upf.h   2021-03-07 13:19:40.937167871 +0000
-+++ b/src/plugins/upf/upf.h       2021-03-07 12:51:36.726939875 +0000
-@@ -167,7 +167,8 @@
- }) gtpu_ie_recovery_t;
- /* *INDENT-ON* */
-
--#define GTPU_V1_HDR_LEN   8
-+#define GTPU_V1_HDR_LEN       8
-+#define GTPU_V1_EXT_HDR_LEN   8
-
- #define GTPU_VER_MASK (7<<5)
- #define GTPU_PT_BIT   (1<<4)
-@@ -187,6 +188,11 @@
-
- #define GTPU_IE_RECOVERY 14
-
-+#define GTPU_EXT_HDR_PRESENT   52
-+#define GTPU_EXT_HDR_PDU_SESSION_CONTAINER   133
-+#define GTPU_NO_MORE_EXT_HDR 0
-+#define GTPU_QFI 6
-+
- /* *INDENT-OFF* */
- typedef CLIB_PACKED(struct
- {
-
-