bootstrap: export Zephyr install directory

Author: pillo79

extra/bootstrap.sh

@@ -10,8 +10,9 @@ source venv/bin/activate
 pip install west
 west init -l .
 west update
+west zephyr-export
 pip install -r ../zephyr/scripts/requirements-base.txt
 # download slim toolchain from https://github.com/zephyrproject-rtos/sdk-ng/releases/tag/v0.16.8
 
 # add here the required blobs based on supported platforms
-west blobs fetch hal_nxp
+west blobs fetch hal_nxp