bootstd: Add a bootflow command

Add a 'bootflow' command to handle listing and selection of bootflow.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index a5c6918..d2ffc53 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -221,6 +221,24 @@
 
 	  This command is not necessary for bootstd to work.
 
+config CMD_BOOTFLOW
+	bool "bootflow"
+	depends on BOOTSTD
+	default y
+	help
+	  Support scanning for bootflows available with the bootdevs. The
+	  bootflows can optionally be booted.
+
+config CMD_BOOTFLOW_FULL
+	bool "bootflow - extract subcommands"
+	depends on BOOTSTD_FULL
+	default y if BOOTSTD_FULL
+	help
+	  Add the ability to list the available bootflows, select one and obtain
+	  information about it.
+
+	  This command is not necessary for bootstd to work.
+
 config BOOTM_EFI
 	bool "Support booting UEFI FIT images"
 	depends on CMD_BOOTEFI && CMD_BOOTM && FIT