x86/kernel: Mark expected switch-case fall-throughs

In preparation to enable -Wimplicit-fallthrough by default, mark
switch-case statements where fall-through is intentional, explicitly in
order to fix a couple of -Wimplicit-fallthrough warnings.

Warning level 3 was used: -Wimplicit-fallthrough=3.

 [ bp: Massasge and trim commit message. ]

Signed-off-by: Gustavo A. R. Silva <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Baoquan He <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: Daniel Thompson <[email protected]>
Cc: David Wang <[email protected]>
Cc: Douglas Anderson <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jan Beulich <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Nicolai Stange <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Pu Wen <[email protected]>
Cc: Suravee Suthikulpanit <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: x86-ml <[email protected]>
Link: https://lkml.kernel.org/r/20190125183903.GA4712@embeddedor

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