libhidl: add jmpollock to OWNERS BUG=b:157855577 TEST=none Change-Id: I07a6793ee1526167bb990b5cd704ea36f19b802a Reviewed-on: https://chromium-review.googlesource.com/c/aosp/platform/system/libhidl/+/2371630 Tested-by: Jim Pollock <[email protected]> Commit-Queue: Jim Pollock <[email protected]> Auto-Submit: Jim Pollock <[email protected]> Reviewed-by: Stuart Langley <[email protected]>