override correctly busybox's applet when CONFIG_FLASH_ERASEALL=y is set
Error: update-alternatives: not linking /builds/image/1.0-r0/rootfs/usr/
sbin/flash_eraseall to /bin/busybox.nosuid since /builds/image/1.0-r0/
rootfs/usr/sbin/flash_eraseall exists and is not a link
Signed-off-by: Andrej Valek <andrej.valek@siemens.com> Signed-off-by: Ross Burton <ross.burton@intel.com>