mmc-fixes-for-3.4-rc4

MMC fixes for 3.4-rc4:
 The major fixes here are:
  * Build fix for omap_hsmmc with OF against 3.4-rc1.
  * Fix CONFIG_MMC_UNSAFE_RESUME semantics regression against 3.3,
    which broke hotplug card detection when UNSAFE_RESUME is set.
  * Fix a race condition in omap_hsmmc with runtime PM.
  * Fix two libertas SDIO-powered-resume regressions.
 Also small fixes for discard/sanitize, dw_mmc, cd-gpio and esdhc-imx.
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