staging: spmi: hisi-spmi-controller: coding style fixup

In order to prepare for upstream, fix most coding style issues.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/3cd60dd31e481a4f824f7085d70fc243ecbbb94f.1597647359.git.mchehab+huawei@kernel.org


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