UPSTREAM: ath10k: use 64-bit crash dump timestamps

The dump format uses 64-bit timestamps already, but calling
getnstimeofday() only returns a 32-bit number on 32-bit architectures,
so that will overflow in y2038.

This changes it to use ktime_get_real_ts64() instead.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Git-commit: dafa420360129781744ef48736a6dbed8f622077
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git


Change-Id: Ie9c5d5b3435843e117a9282d997ced2d7e5538d1
Signed-off-by: Dundi Raviteja <dundi@codeaurora.org>