drm/i915/gtt: drop unneeded make_unshrinkable

We already do this when mapping the pages.
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211018091055.1998191-3-matthew.auld@intel.com

drivers/gpu/drm/i915/gt/gen6_ppgtt.c

@@ -185,7 +185,6 @@ static void gen6_alloc_va_range(struct i915_address_space *vm,
 
 			pt = stash->pt[0];
 			__i915_gem_object_pin_pages(pt->base);
-			i915_gem_object_make_unshrinkable(pt->base);
 
 			fill32_px(pt, vm->scratch[0]->encode);
 

drivers/gpu/drm/i915/gt/gen8_ppgtt.c

@@ -301,7 +301,6 @@ static void __gen8_ppgtt_alloc(struct i915_address_space * const vm,
 
 			pt = stash->pt[!!lvl];
 			__i915_gem_object_pin_pages(pt->base);
-			i915_gem_object_make_unshrinkable(pt->base);
 
 			fill_px(pt, vm->scratch[lvl]->encode);