media: coda/venus/s5p_mfc: fix control typo

These two slice modes used by the V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE
control had a silly typo:

V4L2_MPEG_VIDEO_MULTI_SICE_MODE_MAX_MB
V4L2_MPEG_VIDEO_MULTI_SICE_MODE_MAX_BYTES

SICE should be SLICE.

Rename these enum values, keeping the old ones (under #ifndef __KERNEL__)
for backwards compatibility reasons.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>