* Add nRF91 as target in CI builds * Add example linker scripts for nrf91 * Make less nRF52 assumptions example config * Add llvm-tools-preview required for cargo objcopy example
The memory layout of the s140 crept into a number of memory files, which can cause confusion.
This should remove some confusion around embassy-boot-* being a library vs. a binary. The binary is now an example bootloader instead.
