Import SPCI payload size test.

Change-Id: I0a4e63dd1f1ce852ea362a680e91794afd8231d9
diff --git a/driver/linux b/driver/linux
index 1cc6c75..614ed7f 160000
--- a/driver/linux
+++ b/driver/linux
@@ -1 +1 @@
-Subproject commit 1cc6c75d8a5ca147274c31b98f25f33c6a5466c9
+Subproject commit 614ed7ffdf9ebb7ef587ed40527c03eb23a756c5