mmc: improve power-on for sdio wifi card.

These two patches improve power-on management for my 'libertas' wifi card.

On my board the card shares a regulator with a bluetooth device, so turning off the regulator may not powercycle the card. To get it to a clean state it is necessary to hold the reset line down while enabling the regulator.

So the first patch add a reset-gpio function for all sdio cards which is configured through devicetree.

The sequence of commands sent to the sdio device for power-up differs between runtime power resume (which works nicely) and system-suspend resume (which doesn't).
The second patch add to calls to make these sequences the same and allowed my device to work reliably after system suspend (though the libertas driver needs a bit of work before it is completely reliable).

Thanks,
NeilBrown
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NeilBrown (2):
mmc: core: allow a reset gpio to be configured.
mmc: core: reset sdio card properly on resume.

 Documentation/devicetree/bindings/mmc/mmc.txt |    3 +
 drivers/mmc/core/core.c                       |    3 +
 drivers/mmc/core/host.c                       |   12 ++++
 drivers/mmc/core/sdio.c                       |    8 ++-
 drivers/mmc/core/slot-gpio.c                  |   70 +++++++++++++++++++++++++
 include/linux/mmc/slot-gpio.h                 |    4 +
 6 files changed, 97 insertions(+), 3 deletions(-)

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