x86: rename 'genapic' to 'apic'

Rename genapic-> to apic-> references because in a future chagne we'll
open-code all the indirect calls (instead of obscuring them via macros),
so we want this reference to be as short as possible.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/include/asm/genapic.h b/arch/x86/include/asm/genapic.h
index c27efde..3970da3 100644
--- a/arch/x86/include/asm/genapic.h
+++ b/arch/x86/include/asm/genapic.h
@@ -94,7 +94,7 @@
 	void (*inquire_remote_apic)(int apicid);
 };
 
-extern struct genapic *genapic;
+extern struct genapic *apic;
 
 #ifdef CONFIG_X86_32