mmc: Char SDIO Device Driver

Squashed commit of the following:

commit c3fb53893cbc4b5e217ef176010d1b88982a9454
Author: Alexander Kolesnikov <akolesni@codeaurora.org>
Date:   Wed Sep 15 17:16:52 2010 +0200

    csdio: Set/get vdd ioctl support

    Implement power up/down sequence for internal UBM chip.
    This commit includes generic, platform independent part.

    CRs-Fixed: 255849
    Change-Id: I526c78765ba32b310463a231c5cf578cb37c6deb
Signed-off-by: Alexander Kolesnikov <akolesni@codeaurora.org>

commit e1ba27311fcf3de2a5ca9a3fc1303328720dd120
Author: Nela Gurevich <nelag@codeaurora.org>
Date:   Thu Aug 19 14:00:09 2010 +0300

    csdio: Move csdio.h to kernel/include

    Change-Id: Idf8df750e9f3bcc014d1afa673c9c27c97253195
Signed-off-by: Nela Gurevich <nelag@codeaurora.org>

commit 31d1b09c677c26efb71fa36ff6fe1e7f2d83abbc
Author: Alexander Kolesnikov <akolesni@codeaurora.org>
Date:   Tue Aug 10 13:26:20 2010 +0300

    mmc: Char SDIO Device Driver

    The Char SDIO Device Driver is an interface which exposes an SDIO
    card/function from kernel space as a char device in user space.

    Change-Id: If298cdd6d4426b700e69affa5a3602cd221ad89c
Signed-off-by: Alexander Kolesnikov <akolesni@codeaurora.org>

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>