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Rework the initramfs support in xenguest FSTYPE to be compatible with
Dunfell and remove an error with non existing recipeinfo during build.
- remove initramfs support in FSTYPE and do_deploy function
- create a KERNEL CLASS to create a xenguest image containing the kernel
bundle with initramfs during kernel compilation (only done if FSTYPE
contain xenguest and initramfs bundle is activated)
- add kernel-xenguest to KERNEL_CLASSES when autonomy-guest
DISTRO_FEATURE is activated
- remove unused parameters from xenguest-image class

Change-Id: If163aa74a2bbbd4f22651abefe8d2ab4677e82b0
Issue-Id: SCM-990
Signed-off-by: Bertrand Marquis <bertrand.marquis@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>