treewide: fix replace with
[] / target / sdk /
nbd build: consistently use 'depends on' instead of '…
nico disable IB & SDK when using an external toolchain…
nbd Detach the building of sdk and imagebuilder from …
nbd set the sdk default to y if CONFIG_ALL is set
nbd fix and enable the sdk
mbm fix BR2_ and CONFIG_ issues
nbd move package/sdk to target/sdk