bazel: add build definitions for subsystems Add BUILD.bazel files for Zephyr subsystems including logging, storage, bluetooth, network, shell, power management, and usb. Change-Id: I630450b19f3797a11430fd1d08c1d54276a771d7 Reviewed-on: https://pigweed-review.googlesource.com/c/third_party/github/zephyrproject-rtos/zephyr/+/458938