Add FOTA over BLE to nrf9151+nrf52840

Hi,

I have a board which is nrf9151 with nrf52840 as BLE controller connected via hci_lpuart. This works fine so far, I am able to do simple AT commands as well as doing some BLE communication. I am using TF-M for nrf9151

Now I am trying to add FOTA over BLE and I just cannot get this to work. To not complicate it even more I am trying the old way - not using sysbuild, but it doesn't help.

So what I have tried:
1. Add child_image/mcu_boot.conf
2. Add configuration to proj.conf
```

CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_SECURE_BOOT=y
CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y
```

I am using ncs 2.7.0

Best regards,
Michal

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