Change asset tracker (thingy91) example to PASSIVE MODE

Hi all,

I'm new to the whole kconfig system, and I can't seem to change the Asset Tracker to passive mode. 

I've tried adding these lines to the prj.conf file:

CONFIG_DATA_DEVICE_MODE_PASSIVE=y
CONFIG_DATA_DEVICE_MODE_ACTIVE=n
and I changed the default of the DATA_DEVICE_MODE choice in Kconfig.data_module to DATA_DEVICE_MODE_PASSIVE
 
Which does seem to add the following line to the autogenerated autoconf.h file:
#define CONFIG_DATA_DEVICE_MODE_PASSIVE 1
But the asset tracker is still in active mode. I checked this by placing break points in the 
apply_config() function in sensor_module.c, which shows me that it is still configuring the system based on messages that turn it into active mode, so it is calling:
accelerometer_callback_set(false);

Where do these messages come from, and how do I change this?
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