tpm2-common: remove misleading comment from the ECC template

TPM2_Sign is actually used for ECC keys.

Signed-off-by: Morten Linderud <morten@linderud.pw>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/src/libcommon/tpm2-common.c b/src/libcommon/tpm2-common.c
index ee1d9d7..a3537cf 100644
--- a/src/libcommon/tpm2-common.c
+++ b/src/libcommon/tpm2-common.c
@@ -2988,9 +2988,6 @@
 {
 	pub->type = TPM_ALG_ECC;
 	pub->nameAlg = name_alg;
-	/* note: all our keys are decrypt only.  This is because
-	 * we use the TPM2_RSA_Decrypt operation for both signing
-	 * and decryption (see e_tpm2.c for details) */
 	VAL(pub->objectAttributes) =
 		TPMA_OBJECT_SIGN |
 		TPMA_OBJECT_DECRYPT |