mmc: host: add detect vops chain

Add call from sdio to host_ops to sdhci_ops
in order to indicate when a sdio card is detected.
This will be used by hosts that require special
handling for card detection.

Change-Id: I65ec6ee464d658cd938d9254a0a748e6137f9223
Signed-off-by: Dov Levenglick <dovl@codeaurora.org>