ARM: OMAP: Kconfig cleanup: allow to compile on non-ARM

Remove 'source' of non-existant drivers/ssi/Kconfig.  Having this
there results in a kernel with the OMAP patch not being able to
compile for other platforms.
Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/Kconfig

@@ -84,6 +84,4 @@ source "drivers/auxdisplay/Kconfig"
 
 source "drivers/kvm/Kconfig"
 
-source "drivers/ssi/Kconfig"
-
 endmenu