mender-sdimg: update location of wicenv files
mender-sdimg: update location of wicenv files

OE-core wic cleanups moved location of wic environment files to
STAGING_DIR/imgdata

Signed-off-by: Maciej Borzecki <f609d9f713abcd5f8f0e51f08dc151638a7681e7@rndity.com>

bboozzoo/meta-mender,bboozzoo/meta-mender,bboozzoo/meta-mender,bboozzoo/meta-mender