Add support for industrial IO core and (still staging) driver for AD799x, a high precision I2C ADC family. Signed-off-by: Hartmut Knaack <knaack.h@gmx.de> [juhosg: update subject, reformat commit message] Signed-off-by: Gabor Juhos <juhosg@openwrt.org> SVN-Revision: 38187