Revert "mmc: sdhci: Fix voltage switch delay"

This reverts commit 1061bf5d which is
commit c981cdfb9925f64a364f13c2b4f98f877308a408 upstream.

It breaks the Android ABI so revert it for now.  If this is needed in
the future, it can be brought back in an ABI safe way.

Bug: 161946584
Change-Id: Ia5d24c9adcb06166546c42810759b9193d4eaceb
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>