microblaze: Wire-up getrandom syscall

Add new getrandom syscall.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/microblaze/kernel/syscall_table.S b/arch/microblaze/kernel/syscall_table.S
index 342da7e..c7c806d 100644
--- a/arch/microblaze/kernel/syscall_table.S
+++ b/arch/microblaze/kernel/syscall_table.S
@@ -385,3 +385,4 @@
 	.long sys_sched_getattr
 	.long sys_renameat2
 	.long sys_seccomp
+	.long sys_getrandom		/* 385 */