x86: Move get/set_wallclock to x86_platform_ops

get/set_wallclock() have already a set of platform dependent
implementations (default, EFI, paravirt). MRST will add another
variant.

Moving them to platform ops simplifies the existing code and minimizes
the effort to integrate new variants.

Signed-off-by: Feng Tang <feng.tang@intel.com>
LKML-Reference: <new-submission>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/xen/enlighten.c

@@ -842,8 +842,6 @@ static const struct pv_init_ops xen_init_ops __initdata = {
 };
 
 static const struct pv_time_ops xen_time_ops __initdata = {
-	.set_wallclock = xen_set_wallclock,
-	.get_wallclock = xen_get_wallclock,
 	.sched_clock = xen_sched_clock,
 };
 
@@ -980,6 +978,8 @@ asmlinkage void __init xen_start_kernel(void)
 	x86_cpuinit.setup_percpu_clockev = x86_init_noop;
 
 	x86_platform.calibrate_tsc = xen_tsc_khz;
+	x86_platform.get_wallclock = xen_get_wallclock;
+	x86_platform.set_wallclock = xen_set_wallclock;
 
 #ifdef CONFIG_X86_64
 	/*