[Feature] refactor metax_gpu attention and moe and remove some useless code (PaddlePaddle#3688)

Co-authored-by: yongqiangma <xing.wo@163.com>

Author: handsomecoderyang

fastdeploy/config.py

@@ -894,7 +894,7 @@ def __init__(self, args):
             self.kv_cache_ratio = 1.0
         else:
             self.kv_cache_ratio = 0.75
-        self.enc_dec_block_num = 0 if current_platform.is_iluvatar() else 2
+        self.enc_dec_block_num = 0 if current_platform.is_iluvatar() or current_platform.is_maca() else 2
         self.prealloc_dec_block_slot_num_threshold = 12
         self.cache_dtype = "bfloat16"
         self.model_cfg = None