This list of "valid" qemu machine names is obsolete and incorrect, so
just remove it as it serves no real purpose.
(From yocto-docs rev: ee8839480fe574598b4d52a8fd6c11bb301ad3d9)
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>