Removed unused i915 var.

Fixes: a273e957 ("drm/i915: Allow switching away via vga-switcheroo if uninitialized")
Signed-off-by: NNirmoy Das <nirmoy.das@intel.com>
Reviewed-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230118170624.9326-1-nirmoy.das@intel.comSigned-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com>