Error detecting available memory on RaspberryPi 4B and CANOPi

Affected images versions

Type	Arch	v2021	v2022	v2023dev3	v2023pre
minimal/fixedfunction	arm64			Yes	No

Tested on https://images.apertis.org/weekly/v2023dev3/20221018.2009/arm64/fixedfunction/apertis_ostree_v2023dev3-fixedfunction-arm64-rpi64_20221018.2009.img.gz

Unaffected images versions

• all versions up to v2023dev3 where the support is not available

Steps to reproduce

• Boot image on Pi 4 (8 GB) + CANOPi (2 GB)
• Check available memory

Expected result

• Pi 4 reports 8 GB
• CANOPi reports 2 GB

Actual result

• Both report 1 GB

Reproducibility

1. ✅ always

Impact of bug

• Low performance

Root cause

describe in one line what caused the issue to give a hint to product teams whether they may be impacted or not

Outcomes

• pkg/u-boot!82 (merged)

Management data

This section is for management only, it should be the last one in the description.

/cc @andrunko @mtt2hi @wlozano @sjoerd

Phabricator link: https://phabricator.apertis.org/T9391