Instead of remembering to specify DTB= on the make commandline, this commit
allows the much friendlier make simpleImage.
where .dts is expected to be found in arch/microblaze/boot/dts/
The resulting vmlinux, with the compiled DTS linked in, will be copied to
boot/simpleImage.

This mirrors the same functionality as on PowerPC,
albeit achieving it in a slightly different way.

+ strip simpleImage file
The size of output file is very similar to linux.bin.

vmlinux - full elf without fdt blob
simpleImage..unstrip - full elf with fdt blob
simpleImage. - stripped elf with fdt blob

Add symlink to generic system.dts in platform folder

Signed-off-by: John Williams
Signed-off-by: Michal Simek