media: atomisp: remove duplicate include in sh_css
'ia_css_isys.h' included in 'sh_css.c' is duplicated.
It is also included in the 30th line.
Link: https://lore.kernel.org/linux-media/20210306121104.218696-1-zhang.yunkai@zte.com.cn
Signed-off-by: Zhang Yunkai <zhang.yunkai@zte.com.cn>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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