tests/io_mock.h: add missing includes

When libusb is not around for the tests struct timeval and mode_t are
not defined on mingw. Add both missing header to compile the tests under
MSYS2 MINGW32/64 without libusb.

Change-Id: Ic76653c8f3b5d7043ab6080d4e2e1748590ad070
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/75235
Reviewed-by: Alexander Goncharov <chat@joursoir.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

tests/io_mock.h

@@ -38,6 +38,10 @@
 
 #include <stdint.h>
 
+/* Required for struct timeval and mode_t */
+#include <sys/types.h>
+#include <sys/time.h>
+
 #include "usb_unittests.h"
 
 /* Address value needs fit into uint8_t. */