[PATCH] Fix MMC hierarchy

[Pierre Ossman]

There were some issues with how parents were selected for mmc stuff. The
attribute linux.sysfs_path_device was set for mmc_host:s, even though
they lack a device to be mapped too. This caused problems when a
physical card hade multiple mmc hosts.

The second issue is similar by nature, and made worse by fixing the bug
above. Cards were associated with the last registered mmc_host for the
device. With the fix above they were associated with the physical
device. To fix this we have to look up a new parent based on the mmc
host number. I'm not sure if it's safe doing it this late, but it seems
to work.

Rgds
Pierre
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