Revert "mmc: sdhci: Use max timeout and skip timeout calculation"

This reverts commit fef20d9b.
This is change is not longer needed as timeout is now calculated
at runtime.

Change-Id: I2aae45363676e998f3a64b47563e397d7a67f026
Signed-off-by: Ram Prakash Gupta <rampraka@codeaurora.org>