Convert CONFIG_SCSI to Kconfig

This converts the following to Kconfig:
   CONFIG_SCSI

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/arm/mach-omap2/omap5/Kconfig b/arch/arm/mach-omap2/omap5/Kconfig
index 1a66abd..08f45bc 100644
--- a/arch/arm/mach-omap2/omap5/Kconfig
+++ b/arch/arm/mach-omap2/omap5/Kconfig
@@ -25,12 +25,14 @@
 	select DRA7XX
 	select TI_I2C_BOARD_DETECT
 	select PHYS_64BIT
+	imply SCSI
 
 config TARGET_AM57XX_EVM
 	bool "AM57XX"
 	select BOARD_LATE_INIT
 	select DRA7XX
 	select TI_I2C_BOARD_DETECT
+	imply SCSI
 
 endchoice