fix(certgen): accept ECDSA as EC algorithm alias in JCA key type matching

Some Android 10 devices (e.g. Sony H8296) report EC private key
algorithm as "ECDSA" instead of "EC", causing IllegalArgumentException
in certificate signing and a SIGSEGV crash in the keystore process.

Closes #4

app/src/main/java/org/matrix/TEESimulator/pki/CertificateGenerator.kt

@@ -240,7 +240,7 @@ object CertificateGenerator {
 
         val signerAlgorithm =
             when (signingKeyPair.private.algorithm) {
-                "EC" -> "SHA256withECDSA"
+                "EC", "ECDSA" -> "SHA256withECDSA"
                 "RSA" -> "SHA256withRSA"
                 else -> throw IllegalArgumentException("Unsupported signing key: ${signingKeyPair.private.algorithm}")
             }

app/src/main/java/org/matrix/TEESimulator/pki/NativeCertGen.kt

@@ -105,7 +105,7 @@ object NativeCertGen {
         }
 
         val algorithmName = when (certs[0].publicKey.algorithm) {
-            "EC" -> "EC"
+            "EC", "ECDSA" -> "EC"
             "RSA" -> "RSA"
             else -> certs[0].publicKey.algorithm
         }