otautil: Delete dirUnlinkHierarchy().
This function has become obsolete since we've removed file-based OTA support (it was needed by 'delete_recursive' edify function earlier). Test: mmma -j bootable/recovery Test: Code search shows no active user of the function. Change-Id: If6faaa759d4c849b79acba4e6adb82baadc89f7a
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