perf vendor events powerpc: Fix spelling mistake "icach" -> "icache"

There is a spelling mistake in the description text, fix it.

Signed-off-by: Colin King <colin.king@canonical.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-janitors@vger.kernel.org
Link: http://lore.kernel.org/lkml/20210916081314.41751-1-colin.king@canonical.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/pmu-events/arch/powerpc/power8/other.json

@@ -1046,7 +1046,7 @@
   {
     "EventCode": "0x4e010",
     "EventName": "PM_GCT_NOSLOT_IC_L3MISS",
-    "BriefDescription": "Gct empty for this thread due to icach l3 miss",
+    "BriefDescription": "Gct empty for this thread due to icache l3 miss",
     "PublicDescription": ""
   },
   {