Add hwvulkan_headers to Android build

Android recently split vulkan_headers (vulkan.h etc) from
hwvulkan_headers (HAL module plumbing, etc). Adjust to match.

Change-Id: I912cfa900363307abb271f74d9c8ebc683cada42
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29772
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Tested-by: Chris Forbes <chrisforbes@google.com>
diff --git a/src/Android.bp b/src/Android.bp
index 4ee960b..b770a96 100644
--- a/src/Android.bp
+++ b/src/Android.bp
@@ -626,6 +626,7 @@
             header_libs: [
                 "swiftshader_platform_headers",
 				"vulkan_headers",
+                "hwvulkan_headers",
             ],
             shared_libs: [
                 "libnativewindow",