Removed double KERNEL_IMAGETYPE
Removed double KERNEL_IMAGETYPE

KERNEL_IMAGETYPE is defined in kernel (linux_3.4.bb) and machine
(conf/machine/include/sunxi.inc). This can lead to problems when
trying to change the image type. Removed from kernel.

Signed-off-by: Jens Lucius <59bd0a3ff43b32849b319e645d4798d8a5d1e889@jenslucius.com>

jlucius/meta-sunxi,twoerner/meta-sunxi,jlucius/meta-sunxi,rofehr/meta-sunxi,linux-sunxi/meta-sunxi,jlucius/meta-sunxi,soderstrom-rikard/meta-sunxi,O-Computers/meta-sunxi,soderstrom-rikard/meta-sunxi,ebutera/meta-sunxi,linux-sunxi/meta-sunxi,O-Computers/meta-sunxi,geomatsi/meta-sunxi,ebutera/meta-sunxi,net147/meta-sunxi,geomatsi/meta-sunxi,O-Computers/meta-sunxi,linux-sunxi/meta-sunxi,rofehr/meta-sunxi,twoerner/meta-sunxi,net147/meta-sunxi,rofehr/meta-sunxi