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.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>