libpayload: Fix type issues

There were a number of type issues in libpayload that sneaked in
with 903f8e0.

- size_t and ssize_t were conflicting with gcc builtins
- some stdint types were used in libpayload but not defined
  in our stdint.h

With this patch it's possible to compile libpayload with the
reference toolchain again.

Change-Id: Idd5ccfdd9f3536b36bceca2d101e7405883b10bc
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/2903
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

payloads/libpayload/include/armv7/arch/types.h

@@ -53,8 +53,8 @@ typedef signed long long s64;
 typedef long time_t;
 typedef long suseconds_t;
 
-typedef unsigned int size_t;
-typedef int ssize_t;
+typedef unsigned long size_t;
+typedef long ssize_t;
 
 #ifndef NULL
 #define NULL ((void *)0)

payloads/libpayload/include/stdint.h

@@ -29,8 +29,16 @@
 
 #ifndef __STDINT_H
 #define __STDINT_H
+
 #include <arch/types.h>
 
+typedef long long int      intmax_t;
+typedef unsigned long long uintmax_t;
+
 typedef unsigned long uintptr_t;
 typedef long intptr_t;
+
+#define UINT32_MAX (4294967295U)
+#define UINT64_MAX (18446744073709551615ULL)
+
 #endif

payloads/libpayload/include/x86/arch/types.h

@@ -53,8 +53,8 @@ typedef signed long long s64;
 typedef long time_t;
 typedef long suseconds_t;
 
-typedef unsigned int size_t;
-typedef int ssize_t;
+typedef unsigned long size_t;
+typedef long ssize_t;
 
 #ifndef NULL
 #define NULL ((void *)0)