Init: Allow building of init that is compatible with second init boot

When using second init init has already set up /dev /proc, etc
this will prevent duplicate mount points for those
Define BOARD_USE_NO_DEVFS_SETUP := true to use

Change-Id: I5620664b32e08f39da7ef7c7f9c3824d01f930d6
Signed-off-by: dhacker29 <davidhackerdvm@gmail.com>