Use importlib instead of imp in mojo_bindings_gen

This is to fix incompatibillities issue with Android.bp.

Bug: b:27569341
Test: Compile
Change-Id: Ifa44950b7de01b27dfd266495fc88f820a7b6fc2
Reviewed-on: https://chromium-review.googlesource.com/865734
Reviewed-by: Yuzhu Shen <yzshen@chromium.org>
Commit-Queue: Risan <risan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#529666}
2 files changed