mmc: block: Simplify logging during probe about added partitions

To simplify the code, move the logging into the common mmc_blk_alloc_req()
and drop the rather useless information about the partition type/id.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20210303122049.151986-3-ulf.hansson@linaro.org


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