mmc: Add host ops for enhanced strobe

Some hosts may need additional steps to get HS400 functional in
enhanced strobe mode. Add host ops to facilitate that.

Change-Id: I9663830e7ccedf8bf7970d0724a4c7ce212073fd
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
[subhashj@codeaurora.org: fixed trivial merge conflicts]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
[xiaonian@codeaurora.org: fixed trivial merge conflicts]
Signed-off-by: Xiaonian Wang <xiaonian@codeaurora.org>
2 files changed