MIPS/Perf-events: Remove pmu and event state checking in validate_event()

Why removing pmu checking:
Since 3.2-rc1, when arch level event init is called, the event is already
connected to its PMU. Also, validate_event() is _only_ called by
validate_group() in event init, so there is no need of checking or
temporarily assigning event pmu during validate_group().

Why removing event state checking:
Events could be created in PERF_EVENT_STATE_OFF (attr->disabled == 1), when
these events go through this checking, validate_group() does dummy work.
But we do need to do group scheduling emulation for them in event init.
Again, validate_event() is _only_ called by validate_group().

Reference: http://www.spinics.net/lists/mips/msg42190.html
Signed-off-by: Deng-Cheng Zhu <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: David Daney <[email protected]>
Cc: Eyal Barzilay <[email protected]>
Cc: Zenon Fortuna <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/3108/
Signed-off-by: Ralf Baechle <[email protected]>

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