Finish converting GSL to absl::Span

One less dependency.

Change-Id: Iaac25a3c1312a21a8a2b77b8cfee2463bdb51196
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/y2019/jevois/uart.cc b/y2019/jevois/uart.cc
index 71c37e5..2857bd6 100644
--- a/y2019/jevois/uart.cc
+++ b/y2019/jevois/uart.cc
@@ -2,8 +2,8 @@
 
 #include <array>
 
-#include "aos/util/bitpacking.h"
 #include "absl/types/span.h"
+#include "aos/util/bitpacking.h"
 #include "y2019/jevois/jevois_crc.h"
 #ifdef __linux__
 #include "aos/logging/logging.h"