Add FP3 blobs check

* Uses a flag(FP3_PROPRIETARY_PATH) to look for the blobs.
* Uses default path of device/fairphone/fp3-proprietary if not set.
* Throws an error if blobs are not found.
* Throws an error if a version mismatch is detected between expected
blobs package and current blobs package.

Use initial version 4.A.0013.3, the current FP3 Android 11 MR1 release
candidate, first release with public sources.

Issue: FP3-A11#331
Change-Id: I76d575fb7e3cf3475a602cc6f360571daf7460f7
1 file changed