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/cpu/armv7/ls102xa/Kconfig b/arch/arm/cpu/armv7/ls102xa/Kconfig
index b61f3cd..6a013b2 100644
--- a/arch/arm/cpu/armv7/ls102xa/Kconfig
+++ b/arch/arm/cpu/armv7/ls102xa/Kconfig
@@ -14,6 +14,7 @@
 	select SYS_FSL_HAS_SEC
 	select SYS_FSL_SEC_COMPAT_5
 	select SYS_FSL_SEC_LE
+	imply SCSI
 
 menu "LS102xA architecture"
 	depends on ARCH_LS1021A