Revert adding some arch-specific signal syscalls to <linux/syscalls.h>.

It turns out there is some variance on the calling conventions for
these syscalls, and <asm-generic/syscalls.h> is already the mechanism
used to handle this.  Switch arch/tile over to using that mechanism and
tweak the calling conventions for a couple of tile syscalls to match
<asm-generic/syscalls.h>.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
index 824f230..c70ff14 100644
--- a/arch/tile/kernel/process.c
+++ b/arch/tile/kernel/process.c
@@ -502,7 +502,7 @@
 }
 
 int _sys_clone(unsigned long clone_flags, unsigned long newsp,
-	       int __user *parent_tidptr, int __user *child_tidptr,
+	       void __user *parent_tidptr, void __user *child_tidptr,
 	       struct pt_regs *regs)
 {
 	if (!newsp)