staging: hi6421-spmi-pmic: add a missing dot at copyright

The Huawei's copyright is missing a dot	at the end. Add	it,
in order to make it similar to the other two copyrights.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/8e280ebe4e577e6c2d919346868f0d27f98ebd49.1626515862.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/hikey9xx/hi6421-spmi-pmic.c

@@ -4,7 +4,7 @@
  *
  * Copyright (c) 2013 Linaro Ltd.
  * Copyright (c) 2011 Hisilicon.
- * Copyright (c) 2020-2021 Huawei Technologies Co., Ltd
+ * Copyright (c) 2020-2021 Huawei Technologies Co., Ltd.
  */
 
 #include <linux/bitops.h>