tests/kms_hdr: Add negative test to enforce HDR on non-HDR panel

Negative test is added to ensure HDR is not enabled on
a non-HDR panel. Commit/modeset won't fail. However, in dmesg
we can find

[drm:drm_hdmi_infoframe_set_hdr_metadata [drm_display_helper]]
EOTF Not Supported

v2: -fixed nitpicks (Kamil)

Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>