[chromedriver] Release for Linux binary should maintain hash

Use strip with preserve time option so that zipping the same
ChromeDriver Linux binary does not generate a ZIP archive with
different hash.

Bug: chromedriver:3703
Change-Id: Ib978c491f7e398f0597a0dd9478408bdb60d3ec8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2615100
Auto-Submit: Shengfa Lin <shengfa@google.com>
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841108}

chrome/test/chromedriver/support/release/release.sh

@@ -59,7 +59,7 @@ unzip $src/chromedriver_mac64.zip
 unzip $src/chromedriver_mac64_m1.zip -d chromedriver_mac64_m1/
 unzip $src/chromedriver_win32.zip
 
-strip chromedriver_linux64/chromedriver
+strip -p chromedriver_linux64/chromedriver
 
 zip -j $tgt/chromedriver_linux64.zip chromedriver_linux64/chromedriver
 zip -j $tgt/chromedriver_mac64.zip chromedriver_mac64/chromedriver