mmc: renesas_sdhi: shorten types after refactorization

After TAP refactorization, we can use 'unsigned int' for two more
variables because all the calculations work on this type now.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20200420170230.9091-1-wsa+renesas@sang-engineering.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>