Description of problem:
After the node with a 4k root disk is provisioned, the config drive partition is unable to be mounted. This prevents cloud-init from creating the heat-admin user and copying the ssh keys.

Version-Release number of selected component (if applicable):
openstack-ironic-conductor:16.2.4-15

How reproducible:
Consistently with a 4k root disk, other nodes with a 512 sector size disk work fine

Steps to Reproduce:
1. Attempt to scale out a new node with a 4k root disk
2.
3.

Actual results:
Unable to mount config drive, deploy fails.
In dmesg:
[ 82.511907] isofs_fill_super: bread failed, dev=sda2, iso_blknum=17, block=-2147483648

cloud-init logs:
2023-07-11 05:42:14,601 - subp.py[DEBUG]: Running command ['mount', '-o', 'ro', '-t', 'auto', '/dev/sda2', '/run/cloud-init/tmp/tmpkf7q2n3s'] with allowed return codes [0] (shell=False, capture=True)
2023-07-11 05:42:14,621 - util.py[DEBUG]: Failed mount of '/dev/sda2' as 'auto': Unexpected error while running command.
Command: ['mount', '-o', 'ro', '-t', 'auto', '/dev/sda2', '/run/cloud-init/tmp/tmpkf7q2n3s']
Exit code: 32
Reason: -
Stdout:
Stderr: mount: /run/cloud-init/tmp/tmpkf7q2n3s: wrong fs type, bad option, bad superblock on /dev/sda2, missing codepage or helper program, or other error.
2023-07-11 05:42:14,621 - _init_.py[DEBUG]: Datasource DataSourceConfigDrive [net,ver=None][source=None] not updated for events: New instance first boot
2023-07-11 05:42:14,622 - handlers.py[DEBUG]: finish: init-local/search-ConfigDrive: SUCCESS: no local data found from DataSourceConfigDrive

Expected results:
config drive mounts, cloud-init runs, deploy succeeds

Additional info:
Manual mount fails as well.

The default filesystem for the config drive as configured by ironic is iso9660, which does not support >2k disks.
Changing this to vfat in ironic.conf also fails but with a different mount error in dmesg:

config_drive_format=vfat

[ 83.346563] FAT-fs (sda2): logical sector size too small for device (logical sector size = 512)