vulkan: Add skeleton swapchain support

Loader and driver entry points exist and the call chains are hooked up
properly, but functions are just empty stubs for now.

Change-Id: I6ff95e47d1d09ebed41eda8accb71686c8249546
(cherry picked from commit 038c8a740bbda4650bec776023a26a7fcbf93864)
diff --git a/vulkan/libvulkan/Android.mk b/vulkan/libvulkan/Android.mk
index 3ba7ecd..5898678 100644
--- a/vulkan/libvulkan/Android.mk
+++ b/vulkan/libvulkan/Android.mk
@@ -30,7 +30,8 @@
 LOCAL_SRC_FILES := \
 	entry.cpp \
 	get_proc_addr.cpp \
-	loader.cpp
+	loader.cpp \
+	swapchain.cpp
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 
 LOCAL_SHARED_LIBRARIES := libhardware liblog