qemu_v8: add $(OUT_PATH) recipe

Add a $(OUT_PATH) recipe since $(HAFNIUM_BIN) depends on it.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
diff --git a/qemu_v8.mk b/qemu_v8.mk
index f28b8f2..8909db8 100644
--- a/qemu_v8.mk
+++ b/qemu_v8.mk
@@ -155,6 +155,9 @@
 $(BINARIES_PATH):
 	mkdir -p $@
 
+$(OUT_PATH):
+	mkdir -p $@
+
 include toolchain.mk
 
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