ASoC: MT6660: make spdxcheck.py happy

The SPDX-License-Identifier shall not be suffixed with anything further.
This makes ./scripts/spdxcheck.py complain:

  sound/soc/codecs/mt6660.c: 1:36 Invalid token: //

Clean up SPDX-License-Identifier line to make spdxcheck.py happy.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20200321114022.8545-1-lukas.bulwahn@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/mt6660.c

-// SPDX-License-Identifier: GPL-2.0 //
+// SPDX-License-Identifier: GPL-2.0
 
 // Copyright (c) 2019 MediaTek Inc.