sandbox: Allow building with GENERATE_ACPI_TABLE

At present this option is missing a header file, a function prototype and
the qfw driver needs a header included.

Fix these problems so we can enable this option on sandbox. This will
increase the build coverage.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/misc/qfw.c

@@ -14,6 +14,7 @@
 #include <qfw.h>
 #include <dm.h>
 #include <misc.h>
+#include <tables_csum.h>
 #ifdef CONFIG_GENERATE_ACPI_TABLE
 #include <asm/tables.h>
 #endif