mmc: sdhci-pci: Get rid of glk_cqe_enable()

Now that tuning no longer leaves the Buffer Read Enable bit set (refer
intel_execute_tuning()), glk_cqe_enable() is no longer needed. Get rid of
it.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>