etc/index-perf-all.yaml: add phoronix vkmark_score pattern

To handle below indicators

phoronix-test-suite.vkmark.1024x768.Immediate.vkmark_score
phoronix-test-suite.vkmark.1024x768.Mailbox.vkmark_score
phoronix-test-suite.vkmark.800x600.Immediate.vkmark_score
phoronix-test-suite.vkmark.800x600.Mailbox.vkmark_score

Signed-off-by: Philip Li <[email protected]>

Author: rli9

etc/index-perf-all.yaml

@@ -175,6 +175,7 @@ phoronix-test-suite\..+\.usec: -1
 phoronix-test-suite\..+\.us_per_event: -1
 phoronix-test-suite\..+\.verify_s: 1
 phoronix-test-suite\..+\.vgr_performance_metric: 1
+phoronix-test-suite\..+\.vkmark_score: 1
 phoronix-test-suite\..+\.voices: 1
 phoronix-test-suite\..+\.z_s: 1
 pigz\.throughput: 1