spi: rockchip_sfc: Select BOUNCE_BUFFER

This is required for compiling.

Signed-off-by: John Watts <contact@jookia.org>
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 4224ea7..7a4b319 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -417,6 +417,7 @@
 
 config ROCKCHIP_SFC
 	bool "Rockchip SFC Driver"
+	select BOUNCE_BUFFER
 	help
 	  Enable the Rockchip SFC Driver for SPI NOR flash. This device is
 	  a limited purpose SPI controller for driving NOR flash on certain