rockchip: rk3036: ram: update license

All the source code of sdram_rk3036.c are from Rockchip, update the
copyright to owned by Rockchip.

Because rockchip may use this copy of code both for open source
project and internal project, update the license to use both
GPL2.0+ and BSD-3 Clause.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

arch/arm/mach-rockchip/rk3036/sdram_rk3036.c

@@ -1,6 +1,6 @@
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
 /*
- * (C) Copyright 2015 Google, Inc
+ * (C) Copyright 2015 Rockchip Electronics Co., Ltd
  */
 #include <common.h>
 #include <asm/io.h>