Update ad7134 iio #75

Job	Run time
build (ad4130_iio, MBED_PLATFORM)	4m 6s
build (ad559xr_console, MBED_PLATFORM)	4m 50s
build (ad5770r_console, MBED_PLATFORM)	3m 58s
build (ad590_console, MBED_PLATFORM)	4m 19s
build (ad5933_console, MBED_PLATFORM)	4m 17s
build (ad7124_console, MBED_PLATFORM)	3m 41s
build (ad7124_temperature-measure, MBED_PLATFORM)	4m 0s
build (ad7134_iio, MBED_PLATFORM)	4m 25s
build (ad717x_console, MBED_PLATFORM)	4m 2s
build (ad717x_iio, MBED_PLATFORM)	3m 41s
build (ad719x_iio, MBED_PLATFORM)	4m 21s
build (ad738x_iio, MBED_PLATFORM)	3m 59s
build (ad7606_iio, MBED_PLATFORM)	4m 53s
build (ad7689_iio, MBED_PLATFORM)	4m 51s
build (ad77681_iio, MBED_PLATFORM)	3m 40s
build (adt7420_console, MBED_PLATFORM)	5m 0s
build (evb_discovery_firmware, MBED_PLATFORM)	5m 18s
build (ltc268x_console, MBED_PLATFORM)	4m 16s
build (nanodac_console, MBED_PLATFORM)	4m 31s
	1h 22m 8s

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