staging: hikey9xx: hi6421v600-regulator: cleanup debug msgs

While those were useful during port time from downstream
version, let's get rid of them for good, as it is possible to
get about the same things by enabling regulator debugging code.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/be1b704fcba9f1dd0559174835f1e5390df1cf94.1611212783.git.mchehab+huawei@kernel.org


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