microsoft-surface-rt: nls-iso8859-1 is not included in initramfs

Describe your issue

Module kernel/fs/nls/nls_iso8859-1.ko is in deviceinfo_modules_initfs, but is not included in initramfs.

What's the expected behaviour?

Module is included and loaded, system boots

What's the current behaviour?

initramfs-extra not found error

How to reproduce your issue?

Install pmOS on Microsoft Surface RT

What device are you using?

On what postmarketOS version did you encounter the issue?

• edge (master branch)
• v21.06

On what environment did you encounter the issue?

Phone environments

• Phosh
• Plasma Mobile
• Sxmo

Other

• No environment
• GNOME
• KDE Plasma
• Kodi
• MATE
• Shelli
• Sway
• Weston
• Xfce4
• fbkeyboard
• i3wm

How did you get postmarketOS image?

• from https://images.postmarketos.org
• I built it using pmbootstrap
• It was preinstalled on my device

What's the build date of the image? (in yyyy-mm-dd format)

Additional information

Deviceinfo variable deviceinfo_modules_initfs="nls-cp437 nls-iso8859-1 vfat surface-rt-ec hid-generic i2c-hotplug-gpio i2c-hid-of lvds-codec panel-simple"

Initramfs contents

$ ls lib/modules/5.14.0-rc6-next-20210819-postmarketos-grate/kernel/fs/nls/
nls_cp437.ko

Boot log log.txt

mkinitfs log (no warnings/errors, nothing useful) initfs_log.txt