arm: omap: i2c: revert "omap_i2c" bus names back to "i2c_omap"

Some binary blobs from Nokia (FCam 1.22) and configuratio files for
libomap3camd expect names to be i2c_omap... not omap_i2c

Signed-off-by: Filip Matijević <filip.matijevic.pz@gmail.com>
n9: fix for changed defines

FCam binary blob is using some defines that have changed in new
kernel and this is fixed by adding them.

Signed-off-by: Filip Matijević <filip.matijevic.pz@gmail.com>
n9: fix for v4l2 event needed by libomap3camd

Nokia binary blob libomap3camd is expecting to receive
V4L2_EVENT_OMAP3ISP_HS_VS from OMAP3ISP CCDC. Also v4l2_event ABI
changed between kernels so patch includes fix for that.

Signed-off-by: Filip Matijević <filip.matijevic.pz@gmail.com>