media: exynos4-is: drop unused pctrl field and headers

The field 'pctrl' in 'struct fimc_is' is not used, just like
linux/pinctrl/consumer.h headers in the headers.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>