[otp] Add missing newline at end of waiver file

With new verilators, at least, the missing newline causes a warning
from the tool (which means the OTBN smoke test fails)

Signed-off-by: Rupert Swarbrick <rswarbrick@lowrisc.org>
diff --git a/hw/ip/otp_ctrl/lint/otp_ctrl_pkg.vlt b/hw/ip/otp_ctrl/lint/otp_ctrl_pkg.vlt
index a7fc8af..6ca4231 100644
--- a/hw/ip/otp_ctrl/lint/otp_ctrl_pkg.vlt
+++ b/hw/ip/otp_ctrl/lint/otp_ctrl_pkg.vlt
@@ -2,4 +2,4 @@
 // Licensed under the Apache License, Version 2.0, see LICENSE for details.
 // SPDX-License-Identifier: Apache-2.0
 //
-// waiver file for OTP controller package
\ No newline at end of file
+// waiver file for OTP controller package