This reverts commit c5b5b5ccab.
Commit "c5b5b5ccab package/zip: install to staging" contains a typo that
prevents installing to staging.
ZIP_INSTALLING_STAGING_CMDS -> ZIP_INSTALL_STAGING_CMDS
But the package does not install headers or libraries, only ELF and
manual files.
So instead of fixing the install to staging, revert the bogus commit.
Cc: Jan Pedersen <jp@jp-embedded.com>
Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>