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/genx2apic_cluster.c b/arch/x86/kernel/genx2apic_cluster.c
index b9ef009..4e39d9a 100644
--- a/arch/x86/kernel/genx2apic_cluster.c
+++ b/arch/x86/kernel/genx2apic_cluster.c
@@ -182,7 +182,7 @@
 	per_cpu(x86_cpu_to_logical_apicid, cpu) = apic_read(APIC_LDR);
 }
 
-struct genapic apic_x2apic_cluster = {
+struct apic apic_x2apic_cluster = {
 
 	.name				= "cluster x2apic",
 	.probe				= NULL,