radv: Take image alignment into account when allocating MUTABLE pool.

Allocating a descriptor set is aligned to 32 bytes, so just like the
other buffer types, bump the descriptor size to 32 bytes when allocating
MUTABLE descriptor types from a pool.

Fixes: 86644b84b9 ("radv: Implement VK_VALVE_mutable_descriptor_type.")
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10132>

src/amd/vulkan/radv_descriptor_set.c

@@ -756,6 +756,8 @@ radv_CreateDescriptorPool(VkDevice _device, const VkDescriptorPoolCreateInfo *pC
             if (radv_mutable_descriptor_type_size_alignment(
                    &mutable_info->pMutableDescriptorTypeLists[i], &mutable_size,
                    &mutable_alignment)) {
+               /* 32 as we may need to align for images */
+               mutable_size = align(mutable_size, 32);
                bo_size += mutable_size * pCreateInfo->pPoolSizes[i].descriptorCount;
             }
          } else {