perf tests attr: Fix group stat tests

We started to use group read whenever it's possible:

  82bf311 perf stat: Use group read for event groups

That breaks some of attr tests, this change adds the new possible
read_format value.

Signed-off-by: Jiri Olsa <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Hendrik Brueckner <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Thomas-Mich Richter <[email protected]>
LPU-Reference: 20170928160633.GA26973@krava
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: Jiri Olsa

tools/perf/tests/attr/test-stat-group

@@ -6,10 +6,12 @@ ret     = 1
 [event-1:base-stat]
 fd=1
 group_fd=-1
+read_format=3|15
 
 [event-2:base-stat]
 fd=2
 group_fd=1
 config=1
 disabled=0
 enable_on_exec=0
+read_format=3|15

tools/perf/tests/attr/test-stat-group1

@@ -6,10 +6,12 @@ ret     = 1
 [event-1:base-stat]
 fd=1
 group_fd=-1
+read_format=3|15
 
 [event-2:base-stat]
 fd=2
 group_fd=1
 config=1
 disabled=0
 enable_on_exec=0
+read_format=3|15