mmc: sdhci-msm: Cancel disabling AHB bus transfer

The SDCC5 controller and later revisions can handle reset in middle of
an ongoing transfer without the need to disable AHB bus transaction
separately. Disable the workaround for the newer revisions of the core.

Change-Id: I825bff8cccfc3084af9bbbf67a241bb73647872f
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>