kernel-imximage.bbclass: Linux kernel with DCD headers

This new image type adds support to generate a Linux kernel with DCD
headers. Essentially it adds support to directly boot a Linux kernel
without a bootloader.

As the Linux kernel will be boot directly, it required that the Device
Tree is appended to the kernel image, which had support included in
OE-Core.

To have the Linux kernel generated with the DCD headers, following
steps must be followed:

 - Linux kernel recipe must inherit kernel-imximage class;
 - Device Tree appended Linux kernel must be used
   (KERNEL_DEVICETREE_BUNDLE = "1");
 - DCD header configuration must be provided (dcd.cfg or
   dcd-<devicetree>.cfg);

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>

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