Update on "[Executorch][llama] Hookup use_attention_mask option in the source transforms inside llm mananger"

Differential Revision: [D73222734](https://our.internmc.facebook.com/intern/diff/D73222734/)

[ghstack-poisoned]

Author: kimishpatel

examples/models/llama/source_transformation/sdpa.py

@@ -47,7 +47,6 @@ def forward(
             torch._check_is_size(start_pos)
             torch._check(start_pos < self.max_context_len)
             seq_length = q.size(2)
-            # pyre-ignore: Incompatible parameter type [6]
             mask = mask.narrow(0, start_pos, seq_length)
         else:
             mask = mask[input_pos]