perf report: add --spe options for arm-spe

hulk inclusion
category: feature
bugzilla: 18657
CVE: NA

-------------------------------------------

The previous patch added support in "perf report" for some arm-spe
events(llc-miss, tlb-miss, branch-miss, remote-access). This patch
adds their help instructions.
Signed-off-by: NTan Xiaojun <tanxiaojun@huawei.com>
Signed-off-by: NWei Li <liwei391@huawei.com>
Reviewed-by: NXuefeng Wang <wxf.wang@hisilicon.com>
Reviewed-by: NTan Xiaojun <tanxiaojun@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

tools/perf/Documentation/perf-report.txt

@@ -434,6 +434,16 @@ include::itrace.txt[]
 
 	To disable decoding entirely, use --no-itrace.
 
+--spe::
+	Options for decoding arm-spe tracing data. The options are:
+
+		l	synthesize llc miss events
+		t	synthesize tlb miss events
+		b	synthesize branch miss events
+		r	synthesize remote access events
+
+	The default is all events i.e. the same as --spe=ltbr
+
 --full-source-path::
 	Show the full path for source files for srcline output.