staging: Ensure cleaned dependencies are added

Most recipe-sysroot dependencies are handled by these prefuncs. "configure"
is special with a decidated task, prepare_recipe_sysroot which runs
beforehand.

do_prepare_recipe_sysroot does not have to be run before/after
fetch/unpack/patch, they're independent tasks. If fetch/unpack/patch
have sysroot dependencies and those tasks rerun, stale items from the
sysroot could be uninstalled and since prepare_recipe_sysroot doesn't
re-run, they could be missing by the time configure runs.

Fix this by adding the prefunc for do_configure which would ensure
the sysroot is in a good state.

This issue can be reproduced by modifying do_unpack and watching
binutils-native and vulkan-headers failing due to missing makeinfo
or ninja.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>