[sw] Fix CI due to missing #includes.

Signed-off-by: Miguel Young de la Sota <mcyoung@google.com>
diff --git a/sw/device/lib/handler.c b/sw/device/lib/handler.c
index b344415..12bfcdc 100644
--- a/sw/device/lib/handler.c
+++ b/sw/device/lib/handler.c
@@ -4,6 +4,7 @@
 
 #include "handler.h"
 
+#include "sw/device/lib/base/stdasm.h"
 #include "sw/device/lib/common.h"
 #include "sw/device/lib/uart.h"