Allow ECDSA signing OTA files

ECDSA works in the recovery verifier, so we can allow OTA updates to be
signed with EC keys.

Change-Id: If8f2be028843fbfd6c8c9c41b492605d9b5cbeb0
diff --git a/tools/signapk/SignApk.java b/tools/signapk/SignApk.java
index 11139eb..b247072 100644
--- a/tools/signapk/SignApk.java
+++ b/tools/signapk/SignApk.java
@@ -858,10 +858,6 @@
 
 
             if (signWholeFile) {
-                if (!"RSA".equalsIgnoreCase(privateKey[0].getAlgorithm())) {
-                    System.err.println("Cannot sign OTA packages with non-RSA keys");
-                    System.exit(1);
-                }
                 SignApk.signWholeFile(inputJar, firstPublicKeyFile,
                                       publicKey[0], privateKey[0], outputFile);
             } else {