x86: olpc build fix

CONFIG_OLPC needs to depend on MGEODE_LX

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c3f8809..845ea2b2 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1661,6 +1661,7 @@
 
 config OLPC
 	bool "One Laptop Per Child support"
+	depends on MGEODE_LX
 	default n
 	help
 	  Add support for detecting the unique features of the OLPC