1st set of IIO fixes for the 6.2 cycle.

The usual mixed bag - with a bunch of issues found by Carlos Song
in the fxos8700 IMU driver dominating.

hid-accel,gyro
 - Fix wrong returned value when read succeeds.
marvell,berlin-adc
 - Missing of_node_put() in an error path.
nxp,fxos8700 (freescale)
 - Wrong channel type match.
 - Swapped channel read back.
 - Incomplete channel read back (not enough bytes).
 - Missing shift of acceleration data.
 - Range selection didn't work (datasheet bug)
 - Wrong ODR mode read back due to wrong field offset.
 - Drop unused, but wrong define.
 - Fix issue with magnetometer scale an units.
nxp,imx8qxp
- Fix an irq flood due to not reading data early enough.
st,lsm6dsx
 - Add CONFIG_IIO_TRIGGERED_BUFFER select.
st,stm32-adc
 - Fix missing MODULE_DEVICE_TABLE() needed for module aliases.
ti,twl6030
 - Fix missing enable of some channels.
 - Fix a typo in previous patch that meant one channel still wasn't enabled.
xilinx,xadc
 - Carrying on incorrectly after allocation error.
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