KeyMint: wrapping key must be RSA

The description of the `unwrappingParams` parameter to
`importWrappedKey` incorrectly implies that the wrapping key might be an
AES key.  This is not supported; it must be an RSA key as indicated 20
lines further up.

Test: None, comment change
Change-Id: Iabe6125ba8de0c6273f26fef2ed57e15e67a7311
diff --git a/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl b/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl
index fc703e9..1908d05 100644
--- a/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl
+++ b/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl
@@ -479,8 +479,8 @@
      *        structure.
      *
      * @param unwrappingParams must contain any parameters needed to perform the unwrapping
-     *        operation.  For example, if the wrapping key is an AES key the block and padding modes
-     *        must be specified in this argument.
+     *        operation.  For example, the padding mode for the RSA wrapping key must be specified
+     *        in this argument.
      *
      * @param passwordSid specifies the password secure ID (SID) of the user that owns the key being
      *        installed.  If the authorization list in wrappedKeyData contains a