KVM: PPC: Book3S PR: Move kvmppc_save_tm/kvmppc_restore_tm to separate file

It is a simple patch just for moving kvmppc_save_tm/kvmppc_restore_tm()
functionalities to tm.S. There is no logic change. The reconstruct of
those APIs will be done in later patches to improve readability.

It is for preparation of reusing those APIs on both HV/PR PPC KVM.

Some slight change during move the functions includes:
- surrounds some HV KVM specific code with CONFIG_KVM_BOOK3S_HV_POSSIBLE
for compilation.
- use _GLOBAL() to define kvmppc_save_tm/kvmppc_restore_tm()

[paulus@ozlabs.org - rebased on top of 7b0e827c6970 ("KVM: PPC: Book3S HV:
 Factor fake-suspend handling out of kvmppc_save/restore_tm", 2018-05-30)]

Signed-off-by: Simon Guo <wei.guo.simon@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

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