gfxstream-protocols: don't strongly type variable

Fixes the following error on some systems

def __init__(self, name: str, retType: VulkanType, parameters: list[VulkanType], origName=None):
   TypeError: 'type' object is not subscriptable

BUG=262595016
TEST=compile and run

Change-Id: Ifdc35d49a9d1427d925d4fb33eba84c0cbbcc50e
diff --git a/registry/vulkan/scripts/cereal/common/vulkantypes.py b/registry/vulkan/scripts/cereal/common/vulkantypes.py
index 31284e2..dc3a907 100644
--- a/registry/vulkan/scripts/cereal/common/vulkantypes.py
+++ b/registry/vulkan/scripts/cereal/common/vulkantypes.py
@@ -750,7 +750,7 @@
 
 class VulkanAPI(object):
 
-    def __init__(self, name: str, retType: VulkanType, parameters: list[VulkanType], origName=None):
+    def __init__(self, name: str, retType: VulkanType, parameters, origName=None):
         self.name: str = name
         self.origName = name
         self.retType: VulkanType = retType