nRF52833 current consumption too high

[MeisterBob]

Describe the bug

I am trying to minimize the current consumption of my battery powered device based on an nRF52833. I couldn't get the current below 200uA until I told zephyr to build for an nRF52840 in KConfig without changes to the devicetree.

The nRF52833 implementation seems to do something wrong with power management.

To Reproduce
Steps to reproduce the behavior:

git clone https://github.com/MeisterBob/zephyr_nrf_power
cd zephyr_nrf_power
west init -l .
west update
west build -b nrf52833dk_nrf52833
west flash

measure current comsumtion (~205uA)

west build -- -DOVERLAY_CONFIG="test.conf"
west flash

measure current comsumtion (~3uA)

Expected behavior
current consumption should be ~3uA when I build for nRF52833.

Impact
that's a showstopper for battery powered devices based on nRF52833.

Environment (please complete the following information):

• Toolchain: Zephyr SDK 0.13.2
• Zephyr Commit SHA 68f6324