mmc: sdhci: Add support for auto-calibration

This patch adds Programmable Delay Line auto-calibration
support if supported by respective hosts.If the host
supports auto-calibration this change would enable
sending CMD19/CMD21 before any read operation.

CRs-Fixed: 516314
Change-Id: I8a0f51206dc0e174519dd71f0c75267a9e08e7f7
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
[subhashj@codeaurora.org: fixed minor merge conflict]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
[xiaonian@codeaurora.org: fix trivial merge conflict]
Signed-off-by: Xiaonian Wang <xiaonian@codeaurora.org>