shifting to dot product attn for time being

Author: prishajain1

src/maxdiffusion/configs/ltx2_video.yml

@@ -1,7 +1,7 @@
 #hardware
 hardware: 'tpu'
 skip_jax_distributed_system: False
-attention: 'flash'
+attention: 'dot_product'
 attention_sharding_uniform: True 
 precision: 'bf16'
 data_sharding: ['data', 'fsdp', 'context', 'tensor']