i7300_idle: Kconfig, show menu only on x86_64

...since today it contains only a single driver
which is visible to just x86_64

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/idle/Kconfig

@@ -1,13 +1,14 @@
 
 menu "Memory power savings"
+depends on X86_64
 
 config I7300_IDLE_IOAT_CHANNEL
 	bool
 
 config I7300_IDLE
 	tristate "Intel chipset idle memory power saving driver"
 	select I7300_IDLE_IOAT_CHANNEL
-	depends on X86_64 && EXPERIMENTAL
+	depends on EXPERIMENTAL
 	help
 	  Enable memory power savings when idle with certain Intel server
 	  chipsets. The chipset must have I/O AT support, such as the