* Add dummy driver to allow independent testing of mmcblk. * Always build the mmc driver to prevent breakage. * Allow to specify the mmc driver to be used at load time. Change-Id: I4e14b912fb8f3612e252864b53733968b23ac023
Change-Id: Ia1156c6b5e4dbc6c8af37d61b118258053f347ce
Change-Id: I8e8d048da7cdfce5c9f2091969b0db5240e3e89f
Change-Id: I0d460d63070855df9b11eaf3d33eb7bb89c570f1