Remove redundant snapshot functions

Leaving only isSnapshotAware is sufficient and clearer than before.

Test: m nothing
Change-Id: I497ee72ca0cc2386b1b947732473ac63b722621c
diff --git a/cc/snapshot_utils.go b/cc/snapshot_utils.go
index 77d82f1..3e6444b 100644
--- a/cc/snapshot_utils.go
+++ b/cc/snapshot_utils.go
@@ -77,9 +77,12 @@
 	}
 	if _, _, ok := isVndkSnapshotAware(ctx.DeviceConfig(), m, apexInfo); ok {
 		return ctx.Config().VndkSnapshotBuildArtifacts()
-	} else if isVendorSnapshotAware(m, isVendorProprietaryPath(ctx.ModuleDir()), apexInfo) ||
-		isRecoverySnapshotAware(m, isRecoveryProprietaryPath(ctx.ModuleDir()), apexInfo) {
-		return true
+	}
+
+	for _, image := range []snapshotImage{vendorSnapshotImageSingleton, recoverySnapshotImageSingleton} {
+		if isSnapshotAware(m, image.isProprietaryPath(ctx.ModuleDir()), apexInfo, image) {
+			return true
+		}
 	}
 	return false
 }