BACKPORT: s390/time,vdso: convert to the new update_vsyscall interface

Switch to the improved update_vsyscall interface that provides
sub-nanosecond precision for gettimeofday and clock_gettime.

BUG=chromium:324025
TEST=build/boot 3.8 on link

Signed-off-by: Martin Schwidefsky <[email protected]>
(cherry picked from commit 79c74ecbebf76732f91b82a62ce7fc8a88326962)
Signed-off-by: Sonny Rao <[email protected]>
[SR: trivial context conflict in Kconfig]
Conflicts:
	arch/s390/Kconfig

Change-Id: I88661fff354edc7f8ee1f88354b3e45e3d345a48
Reviewed-on: https://chromium-review.googlesource.com/300774
Commit-Ready: Sonny Rao <[email protected]>
Tested-by: Sonny Rao <[email protected]>
Reviewed-by: Olof Johansson <[email protected]>
8 files changed
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