Update the runqemu script to allow the user to specify a device tree
to boot when calling runqemu.
This involves creating a seperate check_dtb() function incase the user
has specified 'none' for the kernel but still wants a device tree.
(From OE-Core rev: 867ac1370b294bfd1ee31f94abb63688f77081a1)
Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
Reviewed-by: Ben Levinsky <ben.levinsky@xilinx.com>
Cc: Ben Levinsky <ben.levinsky@xilinx.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>