c6x: remove duplicate definition of __access_ok

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/c6x/include/asm/uaccess.h

@@ -13,10 +13,6 @@
 #include <linux/compiler.h>
 #include <linux/string.h>
 
-#ifdef CONFIG_ACCESS_CHECK
-#define __access_ok _access_ok
-#endif
-
 /*
  * __copy_from_user/copy_to_user are based on ones in asm-generic/uaccess.h
  *