With the last uses gone, move the type to linux-compat.h.

No functional change intended.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
The primary use of __u{16,32,64} is in the byte-order headers. Iirc
there is a series re-working part of that, so I guess before touching
the logic there that other series would better land first.

--- a/xen/include/xen/linux-compat.h
+++ b/xen/include/xen/linux-compat.h
@@ -12,6 +12,7 @@
 #include <xen/types.h>
 
 typedef int8_t  __s8;
+typedef uint8_t __u8;
 typedef int16_t __s16;
 typedef int32_t __s32;
 typedef int64_t __s64;
--- a/xen/include/xen/types.h
+++ b/xen/include/xen/types.h
@@ -6,7 +6,7 @@
 
 /* Linux inherited types which are being phased out */
 typedef int8_t s8;
-typedef uint8_t u8, __u8;
+typedef uint8_t u8;
 typedef int16_t s16;
 typedef uint16_t u16, __u16;
 typedef int32_t s32;