linux-kexecboot.inc: apply lzma/gzip mangling only to arm kernels
linux-kexecboot.inc: apply lzma/gzip mangling only to arm kernels

* refine custom mips uboot-mkimage, waiting for uImge target in kernel.

Signed-off-by: Andrea Adami <58a22b0beb8ec13ae546a060c8b4c576f22f6153@gmail.com>

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