powerpc, 8xx: move SPI driver to drivers/spi/

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index fe01c73..8a8e8e4 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -223,4 +223,10 @@
 	  Enable the TI Quad-SPI (QSPI) driver for DRA7xx and AM43xx evms.
 	  This driver support spi flash single, quad and memory reads.
 
+config MPC8XX_SPI
+	bool "MPC8XX SPI Driver"
+	depends on 8xx
+	help
+	  Enable support for SPI on MPC8XX
+
 endmenu # menu "SPI Support"