touchscreen: edt-ft5x06: Prevent DMA driver from mapping an area on stack

[Wolfram Sang]

> Frankly speaking I do not know where the fix should actually be. I2C IMX
> driver somehow taking care of this or the users of I2C, touchscreen drivers
> in this case. In my opinion, the fix should be with the touchscreen driver
> however I did like to have feedback or hear opinions on what is the accepted
> solution to this.

There is no accepted solution to this yet :( DMA is/was still too rare for
a serious discussion about this. There is also [1] and probably more...

[1]  http://patchwork.ozlabs.org/patch/220137/
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