perf powerpc: Update global/local variants for p_stage_cyc

Update the arch_support_sort_key() function in powerpc to enable
presenting local and global variants of sort key 'p_stage_cyc'.

Update the "se_header" strings for these in arch_perf_header_entry()
along with instruction latency.

Reported-by: Namhyung Kim <[e-mail]>
Signed-off-by: Athira Jajeev <[e-mail]>
Tested-by: Nageswara R Sastry <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Kajol Jain <[e-mail]>
Cc: Madhavan Srinivasan <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/arch/powerpc/util/event.c

···
 {
 	if (!strcmp(se_header, "Local INSTR Latency"))
 		return "Finish Cyc";
-	else if (!strcmp(se_header, "Pipeline Stage Cycle"))
+	else if (!strcmp(se_header, "INSTR Latency"))
+		return "Global Finish_cyc";
+	else if (!strcmp(se_header, "Local Pipeline Stage Cycle"))
 		return "Dispatch Cyc";
+	else if (!strcmp(se_header, "Pipeline Stage Cycle"))
+		return "Global Dispatch_cyc";
 	return se_header;
 }
 
 int arch_support_sort_key(const char *sort_key)
 {
 	if (!strcmp(sort_key, "p_stage_cyc"))
+		return 1;
+	if (!strcmp(sort_key, "local_p_stage_cyc"))
 		return 1;
 	return 0;
 }