License file doesn't contains the Copyright owner

### Description

The main LICENSE file doesn't contain copyright owner. And some "sub" LICENSE files there is a difference between the LICENSE (Copyright to Google) and Source file (Copyright to AOSP).

### Steps to Reproduce
Navigate on source code for LICENSE files

### Expected Results
Coherent license files;

### Actual Results
Confusion between copyright owner and source files.

### AndroidX Test and Android OS Versions
master

### Link to a public git repo demonstrating the problem:

Start by reviewing the main LICENSE and the sub LICENSE files in the source tree, then compare their copyright owners with the corresponding source files. Clarify which owner each file should name and ensure the license files are consistent; the issue does not identify specific paths or a definitive ownership rule.

Written by the indexing model from the issue text.