builder: Add private includes only to specific packages #164

Job	Run time
populate-targets	4s
newt dump (bleprph-nrf52840pdk, ubuntu-latest)	16s
newt dump (bleprph-nrf52840pdk, windows-latest)	40s
newt dump (bleprph-nrf52840pdk, macos-latest)	28s
newt dump (boot-nrf52dk, ubuntu-latest)	15s
newt dump (boot-nrf52dk, windows-latest)	1m 3s
newt dump (boot-nrf52dk, macos-latest)	40s
newt dump (btshell-nrf52840pdk, ubuntu-latest)	14s
newt dump (btshell-nrf52840pdk, windows-latest)	1m 8s
newt dump (btshell-nrf52840pdk, macos-latest)	27s
newt dump (btshell-nrf52dk, ubuntu-latest)	13s
newt dump (btshell-nrf52dk, windows-latest)	57s
newt dump (btshell-nrf52dk, macos-latest)	50s
newt dump (my_blinky_sim, ubuntu-latest)	20s
newt dump (my_blinky_sim, windows-latest)	1m 28s
newt dump (my_blinky_sim, macos-latest)	28s
	9m 31s

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