mmc: tmio: Replace msleep() of 20ms or less with usleep_range()

As documented in Documentation/timers/timers-howto.txt
as follows, replace msleep() with usleep_range().

msleep(1~20) may not do what the caller intends, and
will often sleep longer (~20 ms actual sleep for any
value given in the 1~20ms range). In many cases this
is not the desired behavior.

Signed-off-by: Masaharu Hayakawa <[email protected]>
Signed-off-by: Simon Horman <[email protected]>
Acked-by: Wolfram Sang <[email protected]>
Signed-off-by: Ulf Hansson <[email protected]>

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