Remove a unused buffer profile to avoid confusion

Signed-off-by: Stephen Sun <[email protected]>

Author: stephenxs

device/mellanox/x86_64-nvidia_sn5600-r0/Mellanox-SN5600-C256S1/buffers_defaults_objects.j2

@@ -88,11 +88,6 @@
             "size":"0",
             "dynamic_th":"0"
         },
-        "q_lossy_minus_7_profile": {
-            "pool": "egress_lossy_pool",
-            "size": "0",
-            "dynamic_th" : "-7"
-        },
         "q_lossy_minus_3_profile": {
             "pool": "egress_lossy_pool",
             "size": "0",