vulkan: use driver::GetData everywhere

Move away from the one-liners defined in loader.cpp.

Change-Id: I73c39cbe21aa3b2079f67590bb40f0cd55563f84
diff --git a/vulkan/libvulkan/driver.h b/vulkan/libvulkan/driver.h
index 4cc3ee7..22db93f 100644
--- a/vulkan/libvulkan/driver.h
+++ b/vulkan/libvulkan/driver.h
@@ -28,6 +28,7 @@
 #include "api_gen.h"
 #include "driver_gen.h"
 #include "debug_report.h"
+#include "swapchain.h"
 
 namespace vulkan {