Revert OPP copyright notice change

Multiple license headers where changed in https://r.android.com/2902250
and https://r.android.com/2902370.

Changing back to the original one as this is not allowed per
https://source.android.com/docs/setup/contribute/licenses#follow_license_and_copyright_best_practices

Bug: 318610752
Test: N/A
Flag: Exempt, comment change
Change-Id: I2b7c6bcfc9cd6d2096379f8e6a200b090efe8818