[Open-graphics] Changes to video controller tests

[Simon]

In the spirit of the suggestion that changes be posted to their own
threads, here are the changes I mentioned earlier in another thread,
before I commit them (svn diff is attached):

-change the dumpfile in rtl/vid_ctl/test/video_test.v to
video_test.vcd to match the source filename
-move a $readmemh call to video_test.v from
rtl/vid_ctl/RAMB16_S36_36.v; this makes it possible to use a relative
path to specify the memory file's location.
-rename RAMB16_S36_36.v to RAMB16_S36_S36.v to match the module
declaration within
-add rtl/vid_ctl/test/Makefile, add a target to
drivers/lib/video_controller/Makefile to produce 32x32.hex, needed by
tests
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