Although pretty much everyone using powernv is running little endian,
we should still test we can build for big endian. So add a
powernv_be_defconfig, which is autogenerated by flipping the endian
symbol in powernv_defconfig.
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
Reviewed-by: NCyril Bur <cyrilbur@gmail.com>