ecore_wl2_input: update a timestamp whenever possible

ecore_wl2_input: update a timestamp whenever possible

Summary:
gettimeofday function returns a accumulated timestamp since around 1970 by the way,
a argument from server looks like a system uptime based timestamp
in some distribution such as tizen.

so that this patch appends a logic that updates a timestamp
inside Ecore_Wl2_Input* whenever possible to
prevent gettimeofday function from being called.

Reviewers: #reviewers, cedric, devilhorns

Reviewed By: #reviewers, devilhorns

Subscribers: devilhorns, cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D7766

Change-Id: I6a74972c326a6484580fed3ab94264ec6f635192