perf jevents: Support ConfigCode

Some PMUs use "config=XXX" for eventcodes, like:

more /sys/bus/event_source/devices/hisi_sccl1_ddrc3/events/act_cmd
config=0x5

However jevents would give an alias with .event field "event=0x5" for
this event. This is handled without issue by the parse events code, but
the pmu alias code gets a bit confused, as it warns about assigning
"event=0x5" over "config=0x5" in perf_pmu_assign_str() when merging
aliases: ./perf stat -v -e act_cmd ...  alias act_cmd differs in field
'value' ...

To make things a bit more straightforward, allow jevents to support
"config=XXX" as well, by supporting a "ConfigCode" field.

Signed-off-by: John Garry <[email protected]>
Acked-by: Ian Rogers <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Mathieu Poirier <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Shaokun Zhang <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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