This is a forward port of the SD/MMC driver from the latest LSP,
melded into linux-2.6.23-git. I've tried to keep the style updates
that were merged recently. I've fixed the exit code (in
davinci_mmcsd_exit) to release clocks, and some failure paths in
davinci_mmcsd_init.

The driver as is performs ~6MB/s reads and ~1MB/s writes with a
block size of 512k (i.e. still needs help!). This patch just makes
the driver usable again.
Signed-off-by: Bernard Blackham <bernard@largestprime.net>
Signed-off-by: Kevin Hilman <khilman@mvista.com>