imx8mm_beacon: Enable fixed regulator in SPL

Because SPL can support SD UHS, the fixed regulator needs to be
enabled in SPL to reset the SD card.

Fixes: 1a5d9c84b472 ("imx8mm_beacon: Enable HS400 on MMC controller")
Signed-off-by: Adam Ford <aford173@gmail.com>
1 file changed