__ppc64__ is not defined on powerpc64, rather __powerpc64__ is, this
uses a patch that is already upstream to fix builds for powerpc64
(From OE-Core rev: 4732222c46652951e66aae377631f4a361179d8f)
(From OE-Core rev: d4cc180e60da43f66618d130009ac5d4930b9228)
Signed-off-by: Matthew McClintock <msm@freescale.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>