mmc: sdhci-cadence: fix bit shift of read data from PHY port

This macro is currently unused, but it may be useful for debug use.
Fix it just in case.

Fixes: ff6af28f ("mmc: sdhci-cadence: add Cadence SD4HC support")
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>