Move ASOP factory extraction tool to its own directory

Moved some source to common folder.
Added uploading script which is also shared by CE CDM partners.
Added README.

Test: m wv_factory_extraction_tool
Bug: 414642286
Change-Id: I565027b75528ab28f9f1eb8d9086c0213de992d0

libwvdrmengine/tools/factory_upload_tool/aosp/README.md

@@ -0,0 +1,34 @@
+# Widevine Factory Extraction Tool for AOSP partners
+
+This tool extracts the BCC and generates the Certificate Signing Request (CSR)
+needed to be uploaded to Wideivine Provisioning server for Prov4 device registration.
+
+## CSR extraction instructions:
+
+1. Make `wv_factory_extraction_tool`:
+    - m wv_factory_extraction_tool
+
+2. Locate build output and adb push it to the target device, e.g.:
+    - adb push out/target/product/{product name}/vendor/bin/hw/wv_factory_extraction_tool /vendor/bin/hw/wv_factory_extraction_tool
+
+3. Restart Widevine service on the device to ensure a clean state
+   before running the tool:
+    - adb shell pkill -f -9 widevine
+
+4. Run the wv_factory_extractor tool on the target device. By default,
+   the tool prints the CSR in JSON format directly to the console.
+    - adb shell /vendor/bin/hw/wv_factory_extraction_tool json_csr
+      or just
+    - adb shell /vendor/bin/hw/wv_factory_extraction_tool
+   For additional options, run the tool with the `help` argument:
+    - adb shell /vendor/bin/hw/wv_factory_extraction_tool help
+
+## Uploading instructions:
+
+1. Save the extracted CSR to `csr.json`.
+
+2. Upload the `csr.json` file using `common/wv_upload_tool.py`:
+    python3 wv_upload_tool.py --credentials=cred.json --org-name={your organization name} --json-csr=csr.json
+    - Replace cred.json with the path to your OAuth 2.0 client credentials file.
+      You can obtain this file through the Google Cloud Platform.
+    - Replace {your organization name} with the name of your organization.