update-bootengine: add missing kernel modules back

[pothos]

Compared to Flatcar major version 3033 these modules went missing from
the initramfs:
glue_helper.ko.xz md4.ko.xz aoe.ko.xz brd.ko.xz drbd.ko.xz nbd.ko.xz
rbd.ko.xz xen-blkfront.ko.xz zram.ko.xz pps_core.ko.xz ptp.ko.xz
nfs_ssc.ko.xz libarc4.ko.xz lru_cache.ko.xz zsmalloc.ko.xz
The "loop" module already was added because PXE boots broke. The
xen-blkfront module however also broke booting on m4 AWS EC2 instances.
Add those modules from the above list back to the initramfs which are
present on the 5.15 kernel.

How to use

Build and test booting on m4 instances, but it also requires the kernel commit revert for networking

Testing done

Tested that the initramfs has the modules now (unpack Stable 3033.2.3 and this build's vmlinuz with extract-initramfs-from-vmlinuz.sh and look that things like zram.ko.xz don't appear on the left sdiff side but not on the right. Also check dracut logs from coreos-kernel.

sdiff -s  <(ls -R vmlinuz-stable-unpacked/|grep ko.xz|sort) <(ls -R fixed-vmlinuz-unpacked/|grep ko.xz|sort)
							      >	acpi_mdio.ko.xz
aoe.ko.xz						      <
							      >	asn1_encoder.ko.xz
							      >	ax88796b.ko.xz
							      >	cifs_arc4.ko.xz
							      >	cifs_md4.ko.xz
							      >	des_generic.ko.xz
							      >	fixed_phy.ko.xz
							      >	fwnode_mdio.ko.xz
glue_helper.ko.xz					      <
							      >	mana.ko.xz
md4.ko.xz						      <
mlxsw_switchib.ko.xz					      <
mlxsw_switchx2.ko.xz					      <
							      >	netfs.ko.xz
nfs_ssc.ko.xz						      <
pps_core.ko.xz						      <
ptp.ko.xz						      <
							      >	scsi_common.ko.xz
							      >	selftests.ko.xz

• Changelog entries added in the respective changelog/ directory (user-facing change, bug fix, security fix, update)
  ↑ in coreos-overlay

[jepio]

If we need to make more changes to this list, then next time let's create a new dracut module to collect these.