[build][cann] Fix CANN provider build failure

[shakhat]

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Description

This patch adds Python headers to CANN provider dependencies when building a library with both training and Python bindings.

Motivation and Context

Fixes #20697

[jywu-msft]

+@wangshuai09 , @zhangsibo1129 Is --enabling_training --use_cann a valid supported combination?

[wangshuai09]

+@wangshuai09 , @zhangsibo1129 Is --enabling_training --use_cann a valid supported combination? Sorry for the slow reply, the training ability is not adapted, so the --enabling_training is not supported.

[shakhat]

+@wangshuai09 , @zhangsibo1129 Is --enabling_training --use_cann a valid supported combination?

Sorry for the slow reply, the training ability is not adapted, so the --enabling_training is not supported.

Ok, I see. My goal was to build one package that I can install in different environments (and CANN inference is one of them). Otherwise I have to build different artifacts for different use cases.