mmc: mmci: Retry the busy start condition

This makes the ux500 ->busy_complete() callback re-read
the status register 10 times while waiting for the busy
signal to assert in the status register.

If this does not happen, we bail out regarding the
command completed already, i.e. before we managed to
start to check the busy status.

There is a comment in the code about this, let's just
implement it to be certain that we can catch this glitch
if it happens.

Signed-off-by: Linus Walleij <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

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