Avoid multiple import statements for anything that is used more than
once. Additionally, drop no longer used imports.
(Bitbake rev: 7c74310440f4d6ec47cf5bacf597e18308b3bb20)
Signed-off-by: Philip Lorenz <philip.lorenz@bmw.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>