drm/i915: Remove unused dpt_total_entries()

dpt_total_entries() is not used anywhere. Remove it.

Reviewed-by: Jani Nikula <[e-mail]>
Signed-off-by: Ville Syrjälä <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/i915/display/intel_dpt.c

···
 	return container_of(vm, struct i915_dpt, vm);
 }
 
-#define dpt_total_entries(dpt) ((dpt)->vm.total >> PAGE_SHIFT)
-
 static void gen8_set_pte(void __iomem *addr, gen8_pte_t pte)
 {
 	writeq(pte, addr);