sched/headers/uapi: Fix linux/sched/types.h userspace compilation errors

Consistently use types provided by <linux/types.h> to fix the following
linux/sched/types.h userspace compilation errors:

/usr/include/linux/sched/types.h:57:2: error: unknown type name 'u32'
u32 size;
...
u64 sched_period;

Signed-off-by: Dmitry V. Levin <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: [e-mail] # v4.12
Fixes: e2d1e2aec572 ("sched/headers: Move various ABI definitions to <uapi/linux/sched/types.h>")
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Ingo Molnar <[e-mail]>

include/uapi/linux/sched/types.h

···
  * available in the scheduling class file or in Documentation/.
  */
 struct sched_attr {
-	u32 size;
+	__u32 size;
 
-	u32 sched_policy;
-	u64 sched_flags;
+	__u32 sched_policy;
+	__u64 sched_flags;
 
 	/* SCHED_NORMAL, SCHED_BATCH */
-	s32 sched_nice;
+	__s32 sched_nice;
 
 	/* SCHED_FIFO, SCHED_RR */
-	u32 sched_priority;
+	__u32 sched_priority;
 
 	/* SCHED_DEADLINE */
-	u64 sched_runtime;
-	u64 sched_deadline;
-	u64 sched_period;
+	__u64 sched_runtime;
+	__u64 sched_deadline;
+	__u64 sched_period;
 };
 
 #endif /* _UAPI_LINUX_SCHED_TYPES_H */