python: add license declaration to BUILD am: c901a99e87 am: 806b7e74f5
python: add license declaration to BUILD am: c901a99e87 am: 806b7e74f5

Original change: https://android-review.googlesource.com/c/platform/external/perfetto/+/1945468

Change-Id: I5b72f5e44762386a46435d09b938f264b1f0b244

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto