Disable graphic support of qemu to support qemu tests in WSL.
(From OE-Core rev: 797af95eb272bd12eac193cdfe72ddffe8aa39ca)
Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>