Linker generator broken for nRF devices

[tejlmand]

Describe the bug
The following PR #71590
broke support for CONFIG_CMAKE_LINKER_GENERATOR=y and thereby also broke support for ARM Compiler 6 for all Nordic nRF devices.

To Reproduce
Steps to reproduce the behavior:

1. cmake -GNinja -Bbuild -DBOARD=nrf52840dk/nrf52840 samples/hello_world/ -DCONFIG_CMAKE_LINKER_GENERATOR=y
2. ninja -Cbuild
3. See error

/opt/zephyr-sdk-0.16.1/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: zephyr/arch/arch/arm/core/cortex_m/libarch__arm__core__cortex_m.a(reset.S.obj): in function `__start':
/projects/github/ncs/zephyr/arch/arm/core/cortex_m/reset.S:97: undefined reference to `z_arm_platform_init'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

Expected behavior
A successful build

Impact
What impact does this issue have on your progress (e.g., annoyance, showstopper)

Possible solutions

• ld scripts, support use of PROVIDE for the generator
• scatter files, steering file can possible be used to direct symbol to correct implementation