arm: dts: am57x: Update devicetree header comments to sync with v6.3-rc6

Signed-off-by: Andrew Davis <afd@ti.com>
diff --git a/arch/arm/dts/am574x-idk.dts b/arch/arm/dts/am574x-idk.dts
index 0de7361..dd3f2ac 100644
--- a/arch/arm/dts/am574x-idk.dts
+++ b/arch/arm/dts/am574x-idk.dts
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
+ * Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
  */