powerpc: drop unused Kconfig symbols

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Michal Marek <mmarek@suse.cz>

arch/powerpc/platforms/embedded6xx/Kconfig

@@ -87,10 +87,6 @@ config MV64X60
 config MPC10X_OPENPIC
 	bool
 
-config MPC10X_STORE_GATHERING
-	bool "Enable MPC10x store gathering"
-	depends on MPC10X_BRIDGE
-
 config GAMECUBE_COMMON
 	bool