x86, apic: rename 'genapic' to 'apic'

Impact: cleanup

Now that all APIC code is consolidated there's nothing 'gen' about
apics anymore - so rename 'struct genapic' to 'struct apic'.

This shortens the code and is nicer to read as well.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index b2da0b1..6b588d6 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -599,7 +599,7 @@
 early_param("elfcorehdr", setup_elfcorehdr);
 #endif
 
-static int __init default_update_genapic(void)
+static int __init default_update_apic(void)
 {
 #ifdef CONFIG_SMP
 	if (!apic->wakeup_cpu)
@@ -610,7 +610,7 @@
 }
 
 static struct x86_quirks default_x86_quirks __initdata = {
-	.update_genapic         = default_update_genapic,
+	.update_apic         = default_update_apic,
 };
 
 struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;