Revert "mmc: sdhci-msm: Add support to vote for vdd io parent regulator"

This reverts commit c54188e5.
Revert vdd io parent regulator vote as it has been changed to
bypass mode.

Change-Id: I7549f2dab38c225996d379257b5ad49d6f779a5f
Signed-off-by: Ram Prakash Gupta <rampraka@codeaurora.org>