rust: Hook up InstallIn functions + Product

InstallIn functions must be hooked up not only to install to special
images, but also to receive special handling by android/arch.go such
that some images are implicitly multilib: first.

Also hook up more product details.

Bug: 178565008
Bug: 165791368
Test: lunch aosp_arm64; m
Change-Id: I1980d5aa9d55f78c222b98d60a404cd6ea5abbfb

rust/compiler.go

@@ -397,8 +397,15 @@ func (compiler *baseCompiler) installDir(ctx ModuleContext) android.InstallPath
 	}
 
 	if compiler.location == InstallInData && ctx.RustModule().UseVndk() {
-		dir = filepath.Join(dir, "vendor")
+		if ctx.RustModule().InProduct() {
+			dir = filepath.Join(dir, "product")
+		} else if ctx.RustModule().InVendor() {
+			dir = filepath.Join(dir, "vendor")
+		} else {
+			ctx.ModuleErrorf("Unknown data+VNDK installation kind")
+		}
 	}
+
 	return android.PathForModuleInstall(ctx, dir, compiler.subDir,
 		compiler.relativeInstallPath(), compiler.relative)
 }