microblaze: Enable accept4 syscall

We had wrong name in unistd.h + I wire up this syscall
in syscall table.
Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/include/asm/unistd.h

@@ -377,7 +377,7 @@
 #define __NR_shutdown		359 /* new */
 #define __NR_sendmsg		360 /* new */
 #define __NR_recvmsg		361 /* new */
-#define __NR_accept04		362 /* new */
+#define __NR_accept4		362 /* new */
 #define __NR_preadv		363 /* new */
 #define __NR_pwritev		364 /* new */
 #define __NR_rt_tgsigqueueinfo	365 /* new */

arch/microblaze/kernel/syscall_table.S

@@ -366,7 +366,7 @@ ENTRY(sys_call_table)
 	.long sys_shutdown
 	.long sys_sendmsg		/* 360 */
 	.long sys_recvmsg
-	.long sys_ni_syscall
+	.long sys_accept4
 	.long sys_ni_syscall
 	.long sys_ni_syscall
 	.long sys_rt_tgsigqueueinfo	/* 365 */