remoteproc: st: Use of_property_present() for testing DT property presence

It is preferred to use typed property access functions (i.e.
of_property_read_<type> functions) rather than low-level
of_get_property/of_find_property functions for reading properties. As
part of this, convert of_get_property/of_find_property calls to the
recently added of_property_present() helper when we just want to test
for presence of a property and nothing more.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230310144736.1546972-1-robh@kernel.org

drivers/remoteproc/st_remoteproc.c

@@ -382,7 +382,7 @@ static int st_rproc_probe(struct platform_device *pdev)
 		clk_set_rate(ddata->clk, ddata->clk_rate);
 	}
 
-	if (of_get_property(np, "mbox-names", NULL)) {
+	if (of_property_present(np, "mbox-names")) {
 		ddata->mbox_client_vq0.dev		= dev;
 		ddata->mbox_client_vq0.tx_done		= NULL;
 		ddata->mbox_client_vq0.tx_block	= false;