mmc: sdhci-msm: support multiple pm_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.

Change-Id: Iade1ec6058e56a7cc81322c2d997df76b7e760a6
Signed-off-by: Dov Levenglick <dovl@codeaurora.org>