mmc: sdhci-msm: add support for multiple qos configurations

Add support for multiple configurations of setting pm_qos
and have all pm_qos handled from the sdhci-msm driver.
This is used in order to support different hardware
architectures (cpu-to-cluster mapping), different pm_qos
requirements for read/write accesses or to compensate for
different scheduler schemes.

Signed-off-by: Dov Levenglick <dovl@codeaurora.org>
Change-Id: I1770ec7dcb35000b64faff0592dd6d81ca2b265c