drm/tests: Add a missing Kconfig select

[Sui Jingfeng]

Hi,

On 5/29/24 17:19, Thomas Hellström wrote:
> Fix the following warning:
> 
> WARNING: unmet direct dependencies detected for DRM_DISPLAY_HDMI_STATE_HELPER
>    Depends on [n]: HAS_IOMEM [=y] && DRM [=y] && DRM_DISPLAY_HELPER [=y] && DRM_DISPLAY_HDMI_HELPER [=n]
>    Selected by [y]:
>    - DRM_KUNIT_TEST [=y] && HAS_IOMEM [=y] && DRM [=y] && KUNIT [=y] && MMU [=y]
> 
> Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
> Fixes: 54cb39e2293b ("drm/connector: hdmi: Create an HDMI sub-state")
> Cc: Maxime Ripard <mripard at kernel.org>
> Cc: dri-devel at lists.freedesktop.org

Acked-by: Sui Jingfeng <sui.jingfeng at linux.dev>