fs: Kconfig: Add a separate option for FS_CRAMFS

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

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: imply FS_CRAMFS for keymile]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-kirkwood/Kconfig b/arch/arm/mach-kirkwood/Kconfig
index 8aa5428..4a7e36e 100644
--- a/arch/arm/mach-kirkwood/Kconfig
+++ b/arch/arm/mach-kirkwood/Kconfig
@@ -35,6 +35,7 @@
 	bool "KM_KIRKWOOD Board"
 	select BOARD_LATE_INIT
 	imply CMD_CRAMFS
+	imply FS_CRAMFS
 
 config TARGET_NET2BIG_V2
 	bool "LaCie 2Big Network v2 NAS Board"