mmc: core: Correct descriptions in mmc_of_parse()

Since it has been converted to use device property API, the function
and field descriptions become outdated. Correct them.

Fixes: 73a47a9b ("mmc: core: Use device_property_read instead of of_property_read")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210419112459.25241-1-andriy.shevchenko@linux.intel.com


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