sdhci: reduce card detection delay

The card detection delay was added early when the behaviour of the
card interrupt was still very much unknown (i.e. before there was a
public specification). As it is now known that it is a debounced signal,
reduce the delay to something more sensible.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

drivers/mmc/host/sdhci.c

@@ -1154,7 +1154,7 @@ static void sdhci_tasklet_card(unsigned long param)
 
 	spin_unlock_irqrestore(&host->lock, flags);
 
-	mmc_detect_change(host->mmc, msecs_to_jiffies(500));
+	mmc_detect_change(host->mmc, msecs_to_jiffies(200));
 }
 
 static void sdhci_tasklet_finish(unsigned long param)