update encoder latency

[cccclai]

Summary:
Before:
{F1793746780}

I 00:00:01.061615 executorch:runner.cpp:395] encoder took 27.085000 ms

After

{F1793747600}

I 00:00:01.235116 executorch:runner.cpp:395] encoder took 8.912000 ms

Differential Revision: D60867022

[pytorch-bot]

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As of commit a2a872a with merge base 34e4870 ():
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This pull request was exported from Phabricator. Differential Revision: D60867022