drm/i915: Delete stray .rej file

drivers/gpu/drm/i915/gt/intel_workarounds.c.rej was incorrectly added to
the tree after solving a conflict. Remove it.

Fixes: 326e30e ("drm/i915: Drop dead code for pvc")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/r/20240325083435.4f970eec@canb.auug.org.au
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240325144728.537855-1-lucas.demarchi@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>