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: I7e8f1b8d2d735685ede87df4bb7fb32ad0a10246
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Signed-off-by: Pavan Anamula <pavana@codeaurora.org>