Docs: return EARLY_BOOT_ENDED instead of INVALID_KEY_BLOB.

All attempts to use an EARLY_BOOT_ONLY key after earlyBootEnded()
is called must fail with Error::EARLY_BOOT_ENDED.

Test: run vts -m VtsAidlKeyMintTarget
Change-Id: Ic3d028ceb7f71e6e266993ec4e877770cd8e5c4a
diff --git a/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl b/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl
index 2caa4d5..926d105 100644
--- a/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl
+++ b/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl
@@ -815,7 +815,7 @@
     /**
      * Called by client to notify the IKeyMintDevice that the device has left the early boot
      * state, and that keys with the EARLY_BOOT_ONLY tag may no longer be used.  All attempts to use
-     * an EARLY_BOOT_ONLY key after this method is called must fail with Error::INVALID_KEY_BLOB.
+     * an EARLY_BOOT_ONLY key after this method is called must fail with Error::EARLY_BOOT_ENDED.
      */
     void earlyBootEnded();