media: i2c: ov9282: Remove duplication of registers

TIMING_VTS (registers 0x380e/f), EXPOSURE (registers
0x3500/1/2), and GAIN (0x3509) are all set from
ov9282_update_exp_gain as part of the control handler,
therefore they do not need to be in the main list of
registers.

Remove them.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>