Call patchoat --verify from art runtime to verify art files

patchoat --verify is used to determine if art files under
/data/dalvik-cache have been tampered with. When tampering is detected,
all files in the dalvik cache are deleted.

Bug: 66697305
Test: Boot with empty /data/dalvik-cache
Test: Boot when /data/dalvik-cache is properly populated
Test: Ensure /data/dalvik-cache/<ISA> is deleted and repopulated when
any of the files in the directory have been tampered with.

Change-Id: If64bee11bede2761d3b931c7aea9d0f60c5c37e9