[Intel-gfx] [PATCH] test/testdisplay:add cursor test

[Lan, Hai]

> what does this test do? For the unknowledgeable user what is supposed to
> happen, that means, when is the test successful and when not?
> 
I wrote this patch to test whether the cursor can work OK. It needs the tester to watch the screen.
If the tester can see the white cursor move from left to right, it can prove that the cursor works OK.
If not, the cursor driver is wrong.
Thanks

Hai Lan