Revert "FROMLIST: overlayfs: handle XATTR_NOSECURITY flag for get xattr method"

This reverts commit ba11202b as it was
not upstream and causes problems with the overlayfs upstream merge
point.  It needs to be added back "soon".

Cc: Mark Salyzyn <salyzyn@android.com>
Cc: kernel-team@android.com
Cc: Mark Salyzyn <salyzyn@google.com>
Bug: 133515582
Bug: 136124883
Bug: 129319403
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ib87b89346ee15079d10afc7d3fc924108b70d6bb