Uses Android.bp vintf_compatibility_matrix for redfin product FCM.

This change also includes the following FCM cleanups:
- Adds level="6", specifying that this product FCM is compatible with an
  S vendor image. This is similar to the framework FCM.
- Marks the HAL as required. This is possible now that the redfin_vf
  target includes an additional product FCM specific to level="5" (R).

Bug: 183507590
Test: m redfin
Test: m redfin_vf, merge with R vendor half
Change-Id: I1b9bbd9b4a723d2479023d1025ef22905e1bc9a1

Android.bp

@@ -33,3 +33,12 @@ license {
     ],
     // large-scale-change unable to identify any license_text files
 }
+
+vintf_compatibility_matrix {
+    name: "redfin_product_compatibility_matrix.xml",
+    stem: "compatibility_matrix.redfin.xml",
+    product_specific: true,
+    srcs: [
+        "device_framework_matrix_product.xml",
+    ],
+}