x86/events: 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]>
Acked-by: Peter Zijlstra <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jacek Tomaka <[email protected]>
Cc: Jia Zhang <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: x86-ml <[email protected]>
Link: https://lkml.kernel.org/r/20190125184917.GA7289@embeddedor

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