Include <sys/types.h> wherever ssize_t is used

`ssize_t` is a POSIX type (cf. IEEE Std 1003.1).

Change-Id: I5f6f114523f541b3a8d845c6faee2c0b9f753bae
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reported-by: Urja Rannikko <urjaman@gmail.com>
Reviewed-on: https://review.coreboot.org/21015
Reviewed-by: David Hendricks <david.hendricks@gmail.com>
Reviewed-by: Urja Rannikko <urjaman@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/ich_descriptors.c b/ich_descriptors.c
index a2f8edf..7916152 100644
--- a/ich_descriptors.c
+++ b/ich_descriptors.c
@@ -34,6 +34,7 @@
 #define UPPER_MAP_OFFSET (4096 - 256 - 4)
 #define getVTBA(flumap)	(((flumap)->FLUMAP1 << 4) & 0x00000ff0)
 
+#include <sys/types.h>
 #include <string.h>
 #include "flash.h" /* for msg_* */
 #include "programmer.h"