fs: Kconfig: Add a separate config for FS_CBFS

Rather than using CMD_CBFS for both the filesystem and its command, we
should have a separate option for each. This allows us to enable CBFS
support without the command, if desired, which reduces U-Boot's size
slightly.

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: imply FS_CBFS on SYS_COREBOOT]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/fs/cbfs/Kconfig b/fs/cbfs/Kconfig
new file mode 100644
index 0000000..1608954
--- /dev/null
+++ b/fs/cbfs/Kconfig
@@ -0,0 +1,8 @@
+config FS_CBFS
+	bool "Enable CBFS (Coreboot Filesystem)"
+	help
+	  Define this to enable support for reading from a Coreboot
+	  filesystem. This is a ROM-based filesystem used for accessing files
+	  on systems that use coreboot as the first boot-loader and then load
+	  U-Boot to actually boot the Operating System. You can also enable
+	  CMD_CBFS to get command-line access.