tile: remove compat_sys_lookup_dcookie declaration to fix compile error

With d8d14bd09cdd "fs/compat: fix lookup_dcookie() parameter handling" I changed the type of the len parameter of the lookup_dcookie() syscall.

However I missed that there was still a stale declaration in arch/tile/.. which now causes a compile error on tile:

In file included from fs/dcookies.c:28:0:
include/linux/compat.h:425:17: error: conflicting types for 'compat_sys_lookup_dcookie' fs/dcookies.c:207:1: error: conflicting types for 'compat_sys_lookup_dcookie'

Simply remove the declaration in the tile architecture, which is only a leftover from before the different compat lookup_dcookie() versions have been merged.
The declaration is now in include/linux/compat.h

The build error was reported by Fenguang's build bot.

---
 arch/tile/include/asm/compat.h | 1 -
 1 file changed, 1 deletion(-)

index 78f1f2ded86c..ffd4493efc78 100644
@@ -281,7 +281,6 @@ long compat_sys_pread64(unsigned int fd, char __user *ubuf, size_t count,
 			u32 dummy, u32 low, u32 high);
 long compat_sys_pwrite64(unsigned int fd, char __user *ubuf, size_t count,
 			 u32 dummy, u32 low, u32 high);
-long compat_sys_lookup_dcookie(u32 low, u32 high, char __user *buf, size_t len);
 long compat_sys_sync_file_range2(int fd, unsigned int flags,
 				 u32 offset_lo, u32 offset_hi,
 				 u32 nbytes_lo, u32 nbytes_hi);

1.8.4.5