perf tests bp_account: Add dedicated checking helper is_supported()

The arm architecture supports breakpoint accounting but it doesn't
support breakpoint overflow signal handling.  The current code uses the
same checking helper, thus it disables both testings (bp_account and
bp_signal) for arm platform.

For handling two testings separately, this patch adds a dedicated
checking helper is_supported() for breakpoint accounting testing, thus
it allows supporting breakpoint accounting testing on arm platform; the
old helper test__bp_signal_is_supported() is only used to checking for
breakpoint overflow signal testing.

Signed-off-by: Leo Yan <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Brajeswar Ghosh <[email protected]>
Cc: Florian Fainelli <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Michael Petlan <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Souptick Joarder <[email protected]>
Cc: Will Deacon <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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