arch: Kconfig: imply BINMAN for SANDBOX

To be able to use the tool binman on sandbox,
the config SANDBOX should imply BINMAN.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/arch/Kconfig b/arch/Kconfig
index 1b35fda..8450fdb 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -205,6 +205,7 @@
 	imply KEYBOARD
 	imply PHYSMEM
 	imply GENERATE_ACPI_TABLE
+	imply BINMAN
 
 config SH
 	bool "SuperH architecture"