PPC32: allocate syscall #s for alloc/free_hugepages and exit_group

and add exit_group to the syscall table.

arch/ppc/kernel/misc.S

@@ -1304,6 +1304,9 @@ _GLOBAL(sys_call_table)
 	.long sys_io_getevents
 	.long sys_io_submit	/* 230 */
 	.long sys_io_cancel
+	.long sys_ni_syscall	/* reserved for alloc_hugepages */
+	.long sys_ni_syscall	/* reserved for free_hugepages */
+	.long sys_exit_group
 
 	.rept NR_syscalls-(.-sys_call_table)/4
 		.long sys_ni_syscall

include/asm-ppc/unistd.h

@@ -239,6 +239,9 @@
 #define __NR_io_getevents	229
 #define __NR_io_submit		230
 #define __NR_io_cancel		231
+#define __NR_alloc_hugepages	232
+#define __NR_free_hugepages	233
+#define __NR_exit_group		234
 
 #define __NR(n)	#n