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Arm64 now supports booting a compressed kernel through EFI. This is hidden behind the EFI_ZBOOT Kconfig option. The EFI_ZBOOT is only enabled in the arm64 config because it is not available for x86. X86 relies on an architecture specific compression mechanism on EFI. The KERNEL_ZSTD Kconfig option applies to both arches so move it to commonconfig. The other change required is that the kernel image name changes. In my local build it looks like the kernel size goes down from 59MB to 43MB. Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>