[POWERPC] Align the sys_call_table

Our _GLOBAL macro does a ".align 2" so the alignment is fine for 32
bit, but on 64 bit it is possible for it to end up only 4 byte aligned.
I don't know if it matters, but it can't hurt to 8 byte align it.

It also means that when we build with --emit_relocs, none of our 64 bit
relocations are to misaligned places.
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/kernel/systbl.S

@@ -39,6 +39,8 @@
 #ifdef CONFIG_PPC64
 #define sys_sigpending	sys_ni_syscall
 #define sys_old_getrlimit sys_ni_syscall
+
+	.p2align	3
 #endif
 
 _GLOBAL(sys_call_table)