Convert CONFIG_CMD_SF_TEST to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_SF_TEST

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/arch/Kconfig b/arch/Kconfig
index e063ee0..08f6e7f 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -78,6 +78,7 @@
 	imply LZMA
 	imply SCSI
 	imply CMD_SATA
+	imply CMD_SF_TEST
 
 config SH
 	bool "SuperH architecture"
@@ -111,6 +112,7 @@
 	imply CMD_GETTIME
 	imply CMD_IO
 	imply CMD_IRQ
+	imply CMD_SF_TEST
 
 config XTENSA
 	bool "Xtensa architecture"