drm/i915: pass dev_priv explicitly to HSW_TVIDEO_DIP_VSC_DATA

Avoid the implicit dev_priv local variable use, and pass dev_priv
explicitly to the HSW_TVIDEO_DIP_VSC_DATA register macro.

Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/2f0ed82eb9c759feb3978e38f3b2835f359d6d1f.1716808214.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>