pvmfw: Generate pvmfw.img

Create boot image file containing pvmfw. This is what is flashed to the
'pvmfw' partition.

Test: m pvmfw_img
Bug: 237371962
Change-Id: Iae880b35f1be76f7ebf647de8b0f402fcd8df41a
diff --git a/pvmfw/Android.bp b/pvmfw/Android.bp
index 5bcafd5..57a3df0 100644
--- a/pvmfw/Android.bp
+++ b/pvmfw/Android.bp
@@ -42,3 +42,17 @@
         },
     },
 }
+
+bootimg {
+    name: "pvmfw_img",
+    stem: "pvmfw.img",
+    kernel_prebuilt: ":pvmfw_bin",
+    header_version: "3",
+    partition_name: "pvmfw",
+    enabled: false,
+    target: {
+        android_arm64: {
+            enabled: true,
+        },
+    },
+}