staging: hikey9xx: hi6421-spmi-pmic: simplify includes

There are several uneeded includes. Remove them.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/50087bb41fc262d6930aeda0583546cf9d597b87.1611212783.git.mchehab+huawei@kernel.org


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