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

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>
(cherry picked from commit 64b67defe4eb4de2d2df8acd5584a9e28fa727d3)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>