kexec not working on ARM64 vps

[anisse]

kexec binary is missing on ARM64 vps servers initramfs. This bug is similar to #186, but specific to the arm64 servers. Here are the logs when booting with KEXEC_KERNEL and KEXEC_INITRD:

/init: line 337: xnbd-client: not found
/init: line 337: xnbd-client: not found
/init: line 337: xnbd-client: not found
/init: line 337: xnbd-client: not found
/init: line 337: xnbd-client: not found
/init: line 337: xnbd-client: not found
/init: line 337: xnbd-client: not found
/init: line 337: xnbd-client: not found
/init: line 337: xnbd-client: not found
/init: line 337: xnbd-client: not found
/init: line 337: xnbd-client: not found
/init: line 337: xnbd-client: not found
/init: line 337: xnbd-client: not found
/init: line 337: xnbd-client: not found
/init: line 337: xnbd-client: not found
/init: line 337: xnbd-client: not found
/init: line 337: kexec: not found 

I can confirm that the binary isn't in the initrd; as ran from INITRD_DROPBEAR=1:

~ # find / -name kexec  -xdev
~ #