Revert "[Refactor][EAGLE] 8/N delete mtp_proposer" (#7030)

Reverts vllm-project/vllm-ascend#7016
It breaks E2E test
- vLLM version: v0.16.0
- vLLM main:
4034c3d32e

vllm_ascend/worker/model_runner_v1.py

@@ -109,6 +109,7 @@ from vllm_ascend.sample.sampler import AscendSampler
 from vllm_ascend.spec_decode import get_spec_decode_method
 from vllm_ascend.spec_decode.eagle_proposer import AscendEagleProposer
 from vllm_ascend.spec_decode.medusa_proposer import AscendMedusaProposer
+from vllm_ascend.spec_decode.mtp_proposer import AscendMtpProposer
 from vllm_ascend.spec_decode.ngram_proposer import AscendNgramProposer
 from vllm_ascend.spec_decode.suffix_proposer import AscendSuffixDecodingProposer
 from vllm_ascend.utils import (
@@ -403,7 +404,12 @@ class NPUModelRunner(GPUModelRunner):
     def _set_up_drafter(self):
         # Set up speculative decoding.
         self.drafter: (
-            AscendNgramProposer | AscendEagleProposer | AscendSuffixDecodingProposer | AscendMedusaProposer | None
+            AscendNgramProposer
+            | AscendEagleProposer
+            | AscendMtpProposer
+            | AscendSuffixDecodingProposer
+            | AscendMedusaProposer
+            | None
         ) = None
         self.actual_seq_lengths_q: list[int] = []
         self.decode_token_per_req = 1