mmc: davinci_mmc: Cleanup to use dt in U-boot and static platdata in SPL

mmc: davinci_mmc: Cleanup to use dt in U-boot and static platdata in SPL

Cleanup this driver to use dt in U-boot and static platdata in SPL.
This requires the following steps:

1. Move all platdata assignment from probe() to ofdata_to_platdata().
   This function is only called in U-boot.
2. Replicate all the platdata assignment being done in
   ofdata_to_platdata() in the omapl138 board file. This data is used in
   the SPL case where SPL_OF_CONTROL is not enabled.
3. Remove SPL_OF_CONTROL and related configs from omapl138_lcdk_defconfig

This cleanup effectively reverts 3ef94715cc ('mmc: davinci: fix mmc boot in SPL')

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Tested-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>