weston: Fix gst-record uses MONOTONIC time for IVI-Cluster system

weston: Fix gst-record uses MONOTONIC time for IVI-Cluster system

gst-record plugin uses gettimeofday to adapt gst buffer duration.
When WLAN network access internet, system timer is changed by NTP, then
the gst plugin system stopped.

This patch change to use MONOTONIC timer to detect buffer time frame.

--
The patch is same as
https://gerrit.automotivelinux.org/gerrit/#/c/9417/

Change-Id: I2761b0f9dc3bed58d8556966acc54f9dc13d0556
Signed-off-by: Harunobu Kurokawa <harunobu.kurokawa.dn@renesas.com>