binder: use EINTR for interrupted wait for work

when interrupted by a signal, binder_wait_for_work currently returns
-ERESTARTSYS. This error code is usually restricted to the kernel.

Replace this instance of -ERESTARTSYS with -EINTR.

Bug: 143717177
Test: built, booted, interrupted a worker thread within
binder_wait_for_work
Signed-off-by: Marco Ballesio <balejs@google.com>

Change-Id: I0bd1be173e0a75c917399b773046e819babb9d4b
Signed-off-by: Ruchit <risen@pixelexperience.org>

drivers/android/binder.c

@@ -4188,7 +4188,7 @@ static int binder_wait_for_work(struct binder_thread *thread,
 		binder_inner_proc_lock(proc);
 		list_del_init(&thread->waiting_thread_node);
 		if (signal_pending(current)) {
-			ret = -ERESTARTSYS;
+			ret = -EINTR;
 			break;
 		}
 	}