fix param name

Signed-off-by: jiqing-feng <jiqing.feng@intel.com>

Author: jiqing-feng

optimum/exporters/ipex/modeling_utils.py

@@ -617,8 +617,8 @@ def forward(
             PagedAttention.flash_attn_varlen_func(
                 attn_output,
                 query,
-                key_cache,
-                value_cache,
+                key,
+                value,
                 seq_len_tensor,
                 seq_len_tensor,
                 input_lens.max(),