build(hooks): add Gerrit hook

This change adds the Gerrit commit-msg hook to Husky, such that it now
no longer requires manual installation by the developer.

This hook was pulled directly from the TF-A Gerrit review server.

Change-Id: I79c9b0ce78fd326fda6db7a930b7277690177f28
Signed-off-by: Chris Kay <chris.kay@arm.com>
2 files changed