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
diff --git a/rust/image.go b/rust/image.go
index 5d7c027..5d57f15 100644
--- a/rust/image.go
+++ b/rust/image.go
@@ -136,7 +136,13 @@
 }
 
 func (ctx *moduleContext) ProductSpecific() bool {
-	return false
+	return ctx.ModuleContext.ProductSpecific() || ctx.RustModule().productSpecificModuleContext()
+}
+
+func (c *Module) productSpecificModuleContext() bool {
+	// Additionally check if this module is inProduct() that means it is a "product" variant of a
+	// module. As well as product specific modules, product variants must be installed to /product.
+	return c.InProduct()
 }
 
 func (mod *Module) InRecovery() bool {