Make relative path for native_bridge binaries configurable

This change introduces NativeBridgeRelativePath and
NativeBridgeSecondaryRelativePath product variables to
make relative path to native_bridge binaries configurable.

It also removes moves information about native bridge
host architecture to Target and sets it during decodeTargetProductVariables

Test: make PRODUCT-cf_x86_phone-userdebug dist
Change-Id: Ie736e81eae507e1775566ce9f29135011b12af27

cc/installer.go

@@ -66,9 +66,12 @@ func (installer *baseInstaller) installDir(ctx ModuleContext) android.OutputPath
 	if ctx.toolchain().Is64Bit() && installer.dir64 != "" {
 		dir = installer.dir64
 	}
-	if (!ctx.Host() && !ctx.Arch().Native) || ctx.Target().NativeBridge == android.NativeBridgeEnabled {
+	if !ctx.Host() && !ctx.Arch().Native {
 		dir = filepath.Join(dir, ctx.Arch().ArchType.String())
 	}
+	if ctx.Target().NativeBridge == android.NativeBridgeEnabled {
+		dir = filepath.Join(dir, ctx.Target().NativeBridgeRelativePath)
+	}
 	if installer.location == InstallInData && ctx.useVndk() {
 		dir = filepath.Join(dir, "vendor")
 	}