mfd: sec: Update includes to add missing and remove superfluous ones

mfd: sec: Update includes to add missing and remove superfluous ones

This driver misses to include some of the respective headers of some of
the APIs used. It also includes headers that aren't needed (e.g. due to
previous driver rework where includes weren't updated).

It is good practice to directly include all headers used, which avoids
implicit dependencies and spurious build breakage if someone rearranged
headers, as this could cause the implicit includes to be dropped.

Include the relevant headers explicitly and drop superfluous ones.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: André Draszik <andre.draszik@linaro.org>
Link: https://lore.kernel.org/r/20250409-s2mpg10-v4-6-d66d5f39b6bf@linaro.org
Signed-off-by: Lee Jones <lee@kernel.org>