microblaze: Enable ppoll syscall

Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/kernel/syscall_table.S b/arch/microblaze/kernel/syscall_table.S
index 216db81..4572160 100644
--- a/arch/microblaze/kernel/syscall_table.S
+++ b/arch/microblaze/kernel/syscall_table.S
@@ -313,7 +313,7 @@
 	.long sys_fchmodat
 	.long sys_faccessat
 	.long sys_ni_syscall /* pselect6 */
-	.long sys_ni_syscall /* sys_ppoll */
+	.long sys_ppoll
 	.long sys_unshare		/* 310 */
 	.long sys_set_robust_list
 	.long sys_get_robust_list