soong: Hardcode release-keys instead of dev-keys

- We sign inline.

Change-Id: Idfac2f3a48973a3068da48f04724d5fa4ee5e934
Signed-off-by: Cyber Knight <cyberknight755@gmail.com>

android/config.go

@@ -1056,7 +1056,7 @@ func (c *config) BuildKeys() string {
 	if defaultCert == "" || defaultCert == filepath.Join(testKeyDir, "testkey") {
 		return "test-keys"
 	}
-	return "dev-keys"
+	return "release-keys"
 }
 
 func (c *config) ApexKeyDir(ctx ModuleContext) SourcePath {