board/BuR/brppt1: fix MMC boot

since commit
'd5abcf94c7123167725fc22ace342f0d455093c1' -
ti: boot: Register the MMC controllers in SPL in the same way as in u-boot

MMC boot on brppt1 board is broken, with this commit we make our board
    working again.

Signed-off-by: Hannes Schmelzer <hannes.schmelzer@br-automation.com>
1 file changed