iio: light: Drop BU27008 and BU27010

The ROHM BU27008 and BU27010 RGB sensors got cancelled. I was informed
they never reached mass production stage.

Keeping the drivers around is waste of maintenance resources. Drop the
drivers.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/f4d0aa31f29f160a06cba4856a034fa5636d3372.1732819203.git.mazziesaccount@gmail.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>