newt: Add possibility to use generated linker script #111

Job	Run time
populate-targets	3s
newt dump (bleprph-nrf52840pdk, ubuntu-latest)	22s
newt dump (bleprph-nrf52840pdk, windows-latest)	1m 29s
newt dump (bleprph-nrf52840pdk, macos-latest)	49s
newt dump (boot-nrf52dk, ubuntu-latest)	25s
newt dump (boot-nrf52dk, windows-latest)	1m 43s
newt dump (boot-nrf52dk, macos-latest)	51s
newt dump (btshell-nrf52840pdk, ubuntu-latest)	19s
newt dump (btshell-nrf52840pdk, windows-latest)	1m 4s
newt dump (btshell-nrf52840pdk, macos-latest)	54s
newt dump (btshell-nrf52dk, ubuntu-latest)	23s
newt dump (btshell-nrf52dk, windows-latest)	2m 1s
newt dump (btshell-nrf52dk, macos-latest)	56s
newt dump (my_blinky_sim, ubuntu-latest)	23s
newt dump (my_blinky_sim, windows-latest)	2m 1s
newt dump (my_blinky_sim, macos-latest)	52s
	14m 35s

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