qemuarm64.conf: make runqemu's graphics work

qemuarm64.conf: make runqemu's graphics work

Fixed:
$ runqemu qemuarm64 (without -nographics)
There is no output in qemu console without this fix.

(From OE-Core rev: 40a64e64b2ff41661ff254d0836c5f60120c6795)

(From OE-Core rev: f07c139e91d2173dac4289727d1401a19d6ed821)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>