xen/arm: rename xen_secondary_init and run it on every online cpu
xen/arm: rename xen_secondary_init and run it on every online cpu

Rename xen_secondary_init to xen_percpu_init.
Run xen_percpu_init on the each online cpu, reuse the current on_each_cpu call.
Merge xen_percpu_enable_events into xen_percpu_init.

Signed-off-by: Stefano Stabellini <22a0c6385d750d07aa383c9f813cf6f0228657d8@eu.citrix.com>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs