Revert "msm8974: Enable SDHCI HS400 mode for MSM8974."
Revert "msm8974: Enable SDHCI HS400 mode for MSM8974."

This reverts commit 251526675f8b906d847a3c0f0da38ea9e41ebc08.
the feature branch of msm8974 has it disabled too and it seems to cause
problems on some devices.

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