usb: phy: generic: Use proper helper for property detection

Since commit c141ecc ("of: Warn when of_property_read_bool() is
used on non-boolean properties") a warning is raised if this function
is used for property detection. of_property_present() is the correct
helper for this.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Link: https://lore.kernel.org/r/20250120144251.580981-1-alexander.stein@ew.tq-group.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: tq-steina

drivers/usb/phy/phy-generic.c

@@ -212,7 +212,7 @@ int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop)
 		if (of_property_read_u32(node, "clock-frequency", &clk_rate))
 			clk_rate = 0;
 
-		needs_clk = of_property_read_bool(node, "clocks");
+		needs_clk = of_property_present(node, "clocks");
 	}
 	nop->gpiod_reset = devm_gpiod_get_optional(dev, "reset",
 						   GPIOD_ASIS);