x86, apic: fix build fallout of genapic changes

- make oprofile build
- select X86_X2APIC from X86_UV - it relies on it
- export genapic for oprofile modular build

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index bce241f..8955262 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -316,6 +316,7 @@
 	bool "SGI Ultraviolet"
 	depends on X86_64
 	depends on X86_EXTENDED_PLATFORM
+	select X86_X2APIC
 	---help---
 	  This option is needed in order to support SGI Ultraviolet systems.
 	  If you don't have one of these, you should say N here.