NRF5340 Builds with precompiled images NCS 2.1 / NCS 2.7

Hi -

Using nrf5340 and ncs 2.1/2.7 

To ensure we are testing and integrating the originally released bootloaders and net core images, we'd like to be able to use `west build` to incorporate any or all of the following precompiled images in the final merged build outputs and flash if commanded.

mcuboot
b0n
hci_rpmsg/hci_ipc

For mcuboot, we've had success with CONFIG_MCUBOOT_BUILD_STRATEGY_USE_HEX_FILE and CONFIG_MCUBOOT_HEX_FILE, but don't seem to be able to use similar config options for b0n and hci_ipc.

Thanks!

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