arch: add pkey and rseq syscall numbers everywhere

Most architectures define system call numbers for the rseq and pkey system
calls, even when they don't support the features, and perhaps never will.

Only a few architectures are missing these, so just define them anyway
for consistency. If we decide to add them later to one of these, the
system call numbers won't get out of sync then.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>

arch/ia64/kernel/syscalls/syscall.tbl

@@ -339,3 +339,7 @@
 327	common	io_pgetevents			sys_io_pgetevents
 328	common	perf_event_open			sys_perf_event_open
 329	common	seccomp				sys_seccomp
+330	common	pkey_mprotect			sys_pkey_mprotect
+331	common	pkey_alloc			sys_pkey_alloc
+332	common	pkey_free			sys_pkey_free
+333	common	rseq				sys_rseq