Create an encrypted directory for decompressing compressed APEX

We want to decompress into an encrypted directory so that it can later
be hard linked to other encrypted directories, such as /data/rollback.

Bug: 172911820
Test: atest ApexCompressionTests#testCompressedApexIsDecompressed
Change-Id: I98bc567ba7e8b1ea1b335830d71d1b1f38e6ea33
1 file changed