Revert "mmc: sdhci-msm: Avoid enable SD card power if card is removed"

This reverts commit 82fc4015.
When there is no SD card inserted, this change causes the SD
card driver to wait for the mmc power IRQ that never comes.
As a result, the boot up time may be longer.
Revert this change and fix the original issue properly.

Change-Id: I22b53109c10c3f533ebe1f19f9bed9301810fb77
Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>