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clock_gettime() doesn't call syscall SYS_clock_gettime when VDSO is enabled.
some unittests would fail.

This is happening on aarch64 kernel w/ CL
"arm64: Add support for CLOCK_MONOTONIC_RAW in clock_gettime() vDSO".

enforce to use syscall to SYS_clock_gettime to get around the failure

Bug: internal b/110172084
Test: local test
Cq-Include-Trybots: master.tryserver.chromium.android:android_compile_x64_dbg;master.tryserver.chromium.android:android_compile_x86_dbg
Change-Id: Idc824403faaba7b8504bf89ba10f0ba50422c3f5
Reviewed-on: https://chromium-review.googlesource.com/1187586
Commit-Queue: Yi Fan <yfa@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585885}