Update PowerVR Samples to ToT

A VulkanGlass synchronization fix now allows us to run it in debug
without asserting on a validation layer error, so updating to ToT.

Bug: b/141361933
Change-Id: I8b2ebff6b5d822370d7b62afdf6845d1736c1a1b
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/48289
Presubmit-Ready: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>
diff --git a/third_party/PowerVR_Examples b/third_party/PowerVR_Examples
index afdfce8..409c9d5 160000
--- a/third_party/PowerVR_Examples
+++ b/third_party/PowerVR_Examples
@@ -1 +1 @@
-Subproject commit afdfce88475e76c8f00686b89f4b2700c53ca283
+Subproject commit 409c9d54fdaffe68565283e38dcbbe6c58535925