EGL BlobCache: Add CRC check to multifile

Apply a CRC check during file write, ensuring it is
the last thing applied to the file.

During initialization, verify the contents of the file
and remove if CRC doesn't match.

Add a new test (ModifiedCacheEndMisses) that modifies
the end of the entry and ensures no cache hit.

Test: pubg_mobile_launch ANGLE trace
Test: /data/nativetest64/EGL_test/EGL_test
Test: /data/nativetest64/libEGL_test/libEGL_test
Bug: b/267629017
Change-Id: I54015548b509c9ef2440e80f35b5ec97820a2144