Standardize copyrights with missing (C)

Following: https://source.android.com/docs/setup/contribute/licenses#follow_license_and_copyright_best_practices

This also prevents wrong formatted copyrights being copy-pasted
to new files. // such as in ag/32232279 Patchset 1

Bug: 394958283
Test: atest BluetoothJavaUnitTests
Flag: EXEMPT refactor no-op
Change-Id: I6974689570c566ee8df02461a00b5728dddd8bcc