iio: adc: ad7124: reduce the number of SPI transfers

The ad7124_init_config_vref() function writes the AD7124_ADC_CONTROL
register for each channel that is configured to use the internal
reference.

The ad7124_write_config()function performs 7 SPI transfers for
configuring 2 registers: config_x and filter_x.

Reduce the number of SPI transfers:
-during the probe by only setting the st->adc_control value in
 ad7124_init_config_vref() and writing to the device only at the end of
 ad7124_setup().
-in ad7124_write_config() by grouping writes to the same register.

Signed-off-by: Dumitru Ceclan <[email protected]>
Reviewed-by: Nuno Sa <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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