When exporting vkfence FD with vkGetFenceFdKHR() in SYNC_FD
semantic, vkfence could be reset. Dup and store the SYNC_FD created
vkfence's FD in SyncHelperNativeFence by exporting FD during
initializeWithFd() meanwhile make the eglDupNativeFenceFDANDROID()
only dup the mNativeFenceFd in SyncHelperNativeFence.

Test: angle_end2end_tests
--gtest_filter=EGLSyncTest.AndroidNativeFence_*

Bug: angleproject:2517
Change-Id: I354185d26d0fda72baeb61702c879ed5665db6ec
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2230062Reviewed-by: Jeff Vigil <j.vigil@samsung.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>