zephyr: use minimal CBPRINTF implementation
Addition of cbprintf capability in zephyr
https://github.com/zephyrproject-rtos/zephyr/pull/29876
cause flash footprint rise by ~4 KB. Selecting
CBPRINTF_NANO=y mitigates the footprint rise.
Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>
diff --git a/boot/zephyr/prj.conf b/boot/zephyr/prj.conf
index 7f15372..0c61b0f 100644
--- a/boot/zephyr/prj.conf
+++ b/boot/zephyr/prj.conf
@@ -33,3 +33,5 @@
CONFIG_LOG=y
### Ensure Zephyr logging changes don't use more resources
CONFIG_LOG_DEFAULT_LEVEL=0
+### Decrease footprint by ~4 KB in comparison to CBPRINTF_COMPLETE=y
+CONFIG_CBPRINTF_NANO=y