runqemu-internal: set mutual exclusiveness for serial and nographic options
Use "-nographic" option only if "serial" option is not
specified. Otherwise we get below error when
'runqemu <kernel_image> <rootfs_image> serial' is executed,
(snip)
QEMU 2.2.0 monitor - type 'help' for more information
(qemu) qemu-system-aarch64: -serial stdio: cannot use stdio by multiple
character devices
-- CUT --
(From OE-Core rev:
8b0527951ab71c4a4dc4d1238cd9e9e60a6eb5ee)
Signed-off-by: Jagadeesh Krishnanjanappa <jkrishnanjanappa@mvista.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
