eeprom: at25: Convert to use fwnode_device_is_compatible()

Replace open coded fwnode_device_is_compatible() in the driver.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230119175742.77723-1-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/eeprom/at25.c

@@ -437,12 +437,6 @@ static int at25_probe(struct spi_device *spi)
 	struct spi_eeprom *pdata;
 	bool is_fram;
 
-	err = device_property_match_string(&spi->dev, "compatible", "cypress,fm25");
-	if (err >= 0)
-		is_fram = true;
-	else
-		is_fram = false;
-
 	/*
 	 * Ping the chip ... the status register is pretty portable,
 	 * unlike probing manufacturer IDs. We do expect that system
@@ -462,6 +456,8 @@ static int at25_probe(struct spi_device *spi)
 	at25->spi = spi;
 	spi_set_drvdata(spi, at25);
 
+	is_fram = fwnode_device_is_compatible(dev_fwnode(&spi->dev), "cypress,fm25");
+
 	/* Chip description */
 	pdata = dev_get_platdata(&spi->dev);
 	if (pdata) {