mmc: core: Add deferred bus resume policy.

A card driver can now specify that the underlying bus should *not*
auto-resume with the rest of the system. This is useful for reducing resume
latency as well as saving power when the card driver is not using the
bus. In the future, we'll add support for manual suspend

Change-Id: I077d7dc9311ff12e6e16de631abeac965c8facd9
Signed-off-by: San Mehat <san@google.com>
Git-commit: b44e6c88fc57e08562ff6b4fd68ba89cc2aa21bc
Git-repo: git://git-android.quicinc.com/kernel/msm-3.10


[asutoshd@codeaurora.org: merge conflicts resolved and
similar changes were updated in a different file; due to
changes in kernel version]
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
[subhashj@codeaurora.org: fixed trivial merge conflicts]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>