asm-generic: don't include <asm/segment.h> from <asm/uaccess.h>

<asm/segment.h> is an odd x86 legacy that we shouldn't force on other
architectures.  arc used it to bring in mm_context_t, but we can do
that inside the arc code easily.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arc/include/asm/uaccess.h

@@ -742,6 +742,7 @@ extern long arc_strnlen_user_noinline(const char __user *src, long n);
 
 #endif
 
+#include <asm/segment.h>
 #include <asm-generic/uaccess.h>
 
 #endif

include/asm-generic/uaccess.h

@@ -9,8 +9,6 @@
  */
 #include <linux/string.h>
 
-#include <asm/segment.h>
-
 #define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })
 
 #ifndef KERNEL_DS