The example FIT image source files do not compile with the latest dtc and
mkimage. The following error message is produced:

DTC: dts->dtb  on file "kernel.its"
Error: kernel.its 7:0 - 1:0 syntax error
FATAL ERROR: Unable to parse input tree
./mkimage: Can't read kernel.itb.tmp: Invalid argument

The FIT image source files are missing the "/dts-v1/;" directive at the
beginning of the file. Add the directive to the examples.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>

Create doc/uImage.FIT documentation directory with the following files:
- command_syntax_extensions.txt : extended command syntax description
- howto.txt                     : short usage howto
- source_file_format.txt        : internal new uImage format description

Add example image source files:
- kernel.its
- kernel_fdt.its
- multi.its

Update README appropriately.

Signed-off-by: Marian Balakowicz <m8@semihalf.com>
Signed-off-by: Bartlomiej Sieka <tur@semihalf.com>