mmc: sdhci: Add new quirk for broken SDHCI LED control

Some controllers may not have any LED control to indicate
its status. Use this quirk for such controllers to avoid
registering any LED device with LED class and also to
avoid exposing sysfs nodes which doesn't actually control
any LED.

Change-Id: Ia3414583982bbaa8c8537b74c4ca140071ebb2f8
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>