sandbox: Audit config.h and common.h usage

Remove and replace common.h and config.h in sandbox when it's not needed
and add some explicit includes where needed.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/sandbox/include/asm/io.h b/arch/sandbox/include/asm/io.h
index 77a02e5..3c0a102 100644
--- a/arch/sandbox/include/asm/io.h
+++ b/arch/sandbox/include/asm/io.h
@@ -6,6 +6,8 @@
 #ifndef __SANDBOX_ASM_IO_H
 #define __SANDBOX_ASM_IO_H
 
+#include <linux/types.h>
+
 enum sandboxio_size_t {
 	SB_SIZE_8,
 	SB_SIZE_16,