Revert "MSRTSS uses AppendToPNextChain due to non-NULL pNext."

This reverts commit 33df630f9c8944061902b2e38fe65b280f731802.

Reason for revert: appears to crash
angle_CtsSkQPTestCases_internal_main_presubmit on panther-userdebug
https://r.android.com/2466997

Original change's description:
> MSRTSS uses AppendToPNextChain due to non-NULL pNext.
>
> As discussed in:
> https://chromium-review.googlesource.com/c/angle/angle/+/4116675/comment/3097cb31_16922d39/
>
> Not currently causing issues as it requires very recent drivers but I
> saw the `ASSERT(ptr->pNext == nullptr);` in AddToPNextChain fail
> somewhere.
>
> Bug: angleproject:7899
> Change-Id: Id46162a5aacd3d8599382ce1dfca25aca5e730e1
> Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4296801
> Auto-Submit: Roman Lavrov <romanl@google.com>
> Commit-Queue: Yuxin Hu <yuxinhu@google.com>
> Reviewed-by: Yuxin Hu <yuxinhu@google.com>

Bug: angleproject:7899
Change-Id: Ib59bee567b4249077b67f52dcf763d55dc9a7811
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4307769
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
diff --git a/src/libANGLE/renderer/vulkan/vk_cache_utils.cpp b/src/libANGLE/renderer/vulkan/vk_cache_utils.cpp
index 3034d17..abab85d 100644
--- a/src/libANGLE/renderer/vulkan/vk_cache_utils.cpp
+++ b/src/libANGLE/renderer/vulkan/vk_cache_utils.cpp
@@ -767,8 +767,7 @@
 
     if (renderer->getFeatures().supportsMultisampledRenderToSingleSampled.enabled)
     {
-        // msrtss->pNext is not null so can't use AddToPNextChain
-        AppendToPNextChain(subpass, msrtss);
+        AddToPNextChain(subpass, msrtss);
     }
     else
     {