Merge "init: Add tests and document the new fnmatch behavior in ExternalFirmwareHandler." am: 6939583deb am: b383eb7f99

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1677040

Change-Id: I8ac47c5ed98aeec092783fb1d5f3845eb80a65f2