Adjust the documentation and devicetree overlays so the sample can be
built for any board with an Arduino I2C and SPI pinout, defaulting I2C
and SPI to y to make it easier to switch between the two without
requiring a pristine build.
The user has to choose an appropriate overlay or have a sensor built
in to the board.
Use the newly introduced DEVICE_DT_GET_ANY() in main.c to ask for a
bosch,bme280 without worrying over the details or exposing
DT_DRV_COMPAT-based functionality that is really meant for drivers.
Remove the no-longer-needed board specific overlay for nRF52840 DK;
this is covered by the generic Arduino overlays now.
Fix the datasheet link while we're here.
Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
d090751c3d