memory: tegra: Increase handshake timeout on Tegra20

Turned out that it could take over a millisecond under some circumstances,
like running on a very low CPU/memory frequency. TRM says that handshake
happens when there is a "safe" moment, but not explains exactly what that
moment is. Apparently at least memory should be idling and thus the low
frequency should be a reasonable cause for a longer handshake delay.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/memory/tegra/tegra20-emc.c

@@ -236,7 +236,7 @@ static int emc_complete_timing_change(struct tegra_emc *emc, bool flush)
 	}
 
 	timeout = wait_for_completion_timeout(&emc->clk_handshake_complete,
-					      usecs_to_jiffies(100));
+					      msecs_to_jiffies(100));
 	if (timeout == 0) {
 		dev_err(emc->dev, "EMC-CAR handshake failed\n");
 		return -EIO;