media: i2c: imx290: Make use of get_unaligned_le24(), put_unaligned_le24()

Should be upstream commit 5d129c4539c3

Since we have a proper endianness converters for LE 24-bit data use them.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>