mmc: sdhci-of-dwcmshc: Remove useless "&" of th1520_execute_tuning

The preceding "&" before th1520_execute_tuning is useless, remove it.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20240414164357.2841-1-jszhang@kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>