fsi: Make FSI a menuconfig to ease disabling it all

No need to get into the submenu to disable all FSI-related config entries
Signed-off-by: NVincent Legoll <vincent.legoll@gmail.com>
Acked-by: NJeremy Kerr <jk@ozlabs.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/fsi/Kconfig

@@ -2,9 +2,7 @@
 # FSI subsystem
 #
 
-menu "FSI support"
-
-config FSI
+menuconfig FSI
 	tristate "FSI support"
 	select CRC4
 	---help---
@@ -34,5 +32,3 @@ config FSI_SCOM
 	This option enables an FSI based SCOM device driver.
 
 endif
-
-endmenu