Sets up dither.

Prototype declaration:

> `

>     KMSTATUS KMAPI
>     kmChangeDisplayDitherMode(
>     		IN  KMBOOLEAN       bEnable,
>     );

> `

Description:

>     This function changes the enable/disable status of the dither set at the kmSetDisplayMode function.

Parameters:

>     bEnable(input)
>             This parameter determines whether to use dither when the PowerVR
>     writes the rendering result to the 16-bit frame buffer. If the frame
>     buffer for rendering is RGB888 or ARGB8888, this flag will be ignored.
>                 KM_TRUE    Uses dither.
>                 KM_FALSE   Does not use dither.

Return values:

> Value | Explanation
> KMSTATUS_SUCCESS | Success
> KMSTATUS_INVALID_DISPLAY_MODE | Invalid display mode. A display mode that does not match that specified during initialization was specified.