drm/msm/hdmi: Use the common TMDS char rate constants in 8998 PHY

drm/msm/hdmi: Use the common TMDS char rate constants in 8998 PHY

Replace the driver local defines with the shared constants defined in the
<linux/hdmi.h> header for the minimum and maximum TMDS character rates.

Suggested-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://patch.msgid.link/20260520144424.1633354-9-javierm@redhat.com
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>