VK_KHR_shader_float16_int8, don't skip unknown ext. structs

Bug: 160277060

Change-Id: I07a9ccdfa10f79308c88db36fdc70912c2585c7a
diff --git a/system/vulkan_enc/VkEncoder.cpp b/system/vulkan_enc/VkEncoder.cpp
index 06ef7f0..9fdbe84 100644
--- a/system/vulkan_enc/VkEncoder.cpp
+++ b/system/vulkan_enc/VkEncoder.cpp
@@ -18067,6 +18067,8 @@
 #endif
 #ifdef VK_KHR_8bit_storage
 #endif
+#ifdef VK_KHR_shader_float16_int8
+#endif
 #ifdef VK_ANDROID_native_buffer
 VkResult VkEncoder::vkGetSwapchainGrallocUsageANDROID(
     VkDevice device,