media: staging: rkisp1: rename macros 'RKISP1_DIR_*' to 'RKISP1_ISP_SD_*'

The macros 'RKISP1_DIR_*' are flags that indicate on which
pads of the isp subdevice the media bus code is supported. So the
prefix RKISP1_ISP_SD_ is better.

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Acked-by: Helen Koike <helen.koike@collabora.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>