Finish converting GSL to absl::Span

One less dependency.

Change-Id: Iaac25a3c1312a21a8a2b77b8cfee2463bdb51196
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/motors/print/BUILD b/motors/print/BUILD
index df27ce2..93f54f9 100644
--- a/motors/print/BUILD
+++ b/motors/print/BUILD
@@ -8,7 +8,7 @@
     deps = [
         "//aos/containers:sized_array",
         "//motors/core",
-        "//third_party/GSL",
+        "@com_google_absl//absl/types:span",
     ],
 )