Revert "drm/etnaviv: reject timeouts with tv_nsec >= NSEC_PER_SEC"

This reverts commit 245595e8.

Guido Günther reported issues with this patch that broke existing
user space. Let's revert it for now and fix it properly later on.

Link: https://patchwork.kernel.org/patch/11291089/
https://lore.kernel.org/lkml/20200121114553.2667556-1-arnd@arndb.de/


Cc: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>