spi: rspi: fix build error when CONFIG_OF is not set

This patch fixes an issue that the following build error happens when
the CONFIG_OF is not set:

drivers/spi/spi-rspi.c: In function 'rspi_probe':
drivers/spi/spi-rspi.c:1203:26: error: 'rspi_of_match' undeclared (first use in this function)
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/spi/spi-rspi.c

@@ -1164,6 +1164,7 @@ static int rspi_parse_dt(struct device *dev, struct spi_master *master)
 	return 0;
 }
 #else
+#define rspi_of_match	NULL
 static inline int rspi_parse_dt(struct device *dev, struct spi_master *master)
 {
 	return -EINVAL;