build_verity_tree: Add verbose flag

Signed-off-by: Mohamad Ayyash <mkayyash@google.com>

(cherry picked from commit 70f72fb1035e753f5cef176339618723fba943e2)

Change-Id: Ic1f4c843e9597a9e7c0f43eb908c17420c259d9a
1 file changed