kernel.bbclass: handle embedding of initramfs images

* "All 2.6 Linux kernels contain a gzipped "cpio" format archive, which is
* extracted into rootfs when the kernel boots up."
* (http://www.kernel.org/doc/Documentation/filesystems/ramfs-rootfs-initramfs.txt)
*
* In some cases it can be useful to take advantage of this ability and embed your
* customized rootfs ("the move to early userspace is necessary because finding
* and mounting the real root device is complex").
*
* Therefore, some code was added and since 2009 OpenEmbedded metadata
* provides a convenient way to include your initramfs by setting
* INITRAMFS_IMAGE = "your_initramfs_image.bb"
* and specifying the chosen output format in the initramfs image recipe, e.g.
* IMAGE_FSTYPES = "cpio.gz cpio.lzma"
*
*
* Patch was imported from the OpenEmbedded git server
* (git://git.openembedded.org/openembedded)
*
* Add satndalone task "builtin_initramfs".
* commit  72761e468bb3e905459f2b81ce1bc4d80419481f
* Signed-off-by:Paul Sokolovsky <pmiscml@gmail.com>
*
* 'Remove usage of non-standard variables (DEPLOY_TO) and random renaming
* of output.'
* commit 456ba7ffd159821e86ad7ad4b66ec7d5790bd054
* Richard Purdie <rpurdie@rpsys.net>
*
* 'Fis typo in do_builtin_initramfs.'
* commit 37f2fe4b801df832e93553a08eff24fec736c7d4
* Signed-off-by:Paul Sokolovsky <pmiscml@gmail.com>
*
* 'comment initramfs stuff till rootfs locking works properly (initramfs
* should be optional as well)'
* commit 2818d8b7be1a0d9a59ad3528091d47517d59328b
* Signed-off-by: Koen Kooi <koen@openembedded.org>
*
* 'get initramfs stuff working
* commit 1642b3e8fc81c666713951fdd4e7ff9a50d1c5a8
* Signed-off-by: Thomas Kunze <thommycheck@gmx.de>
*
* 'Fix INITRAMFS logic to stop breaking builds for people not using it'
* commit dcf3049eb9eedf0838af59969b3f70a43298d3d7
* Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
*
* '-change initramfs-logic'
* commit 3e3f297457138e96e2b652658675796853eb0293
* Signed-off-by: Thomas Kunze <thommycheck@gmx.de>
*
* 'move initramfs stuff to configure so we can do postprocessing
* on it with do_configure_append'
* commit fc03e2be0b4470748a8b7707cea7293303adc424
* Signed-off-by: Koen Kooi <koen@openembedded.org>
*
* 'copy gz, lzo, lzma initramfs cpio images.'
* commit 572abc3fdd1076ca35d8c15d269cc9d862101805
* Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
*
* 'move the kernel size check to linux-kexecboot.inc.'
* commit 45f82a941c77e9d747814fa1e337ba803475d327
* Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
*
* Finally, two refinements as discussed on openembedded-core
* mailing list:
* - replace "if image != '' and image is not None:" with "if image"
* - add cpio.xz support

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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