drm/i915/sdvo: stop caching has_hdmi_monitor in struct intel_sdvo

drm/i915/sdvo: stop caching has_hdmi_monitor in struct intel_sdvo

[ Upstream commit f2f9c8cb6421429ef166d6404426693212d0ca07 ]

Use the information stored in display info.

Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/3e9e1dcd554d470bdf474891a431b15e1880f9a0.1685437500.git.jani.nikula@intel.com
Stable-dep-of: 20c2dbff342a ("drm/i915: Skip some timing checks on BXT/GLK DSI transcoders")
Signed-off-by: Sasha Levin <sashal@kernel.org>