staging: media: atomisp: select REGMAP_I2C needed by ap1302.c

REGMAP_I2C should be enabled to build the driver ap1302 because it uses
regmap functions.

Signed-off-by: Jérémy Lefaure <jeremy.lefaure@lse.epita.fr>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>