Bug#977126: linux: No armel kernel can be booted by grub-efi-arm:armel

[Ryutaroh Matsumoto <ryutaroh@ict.e.titech.ac.jp>]

> The rpi flavour doesn't have those constraints, though.  What would be
> the benefit of booting it in UEFI mode?

Thank you for paying your attention!
I considered extending autopkgtest-virt-qemu to armel (and other archs) testbeds at
https://salsa.debian.org/ci-team/autopkgtest/-/merge_requests/100#note_205984

To boot a qemu disk image by qemu-system-*, a booting firmware seems
indispensable, as the autopkgtest maintainer does not like giving -kernel=something
qemu option as
https://salsa.debian.org/ci-team/autopkgtest/-/merge_requests/97#note_205357

A booting firmware for an armel Debian disk image seems only
the qemu-efi-arm Debian package (is there anything else??).
So I resorted to the UEFI booting.
Currently I proposes to use linux-image-armmp-lpae for armel testbed.

Best regards, Ryutaroh