U-boot should not ignore getting the bootmode passed on from the bootrom.
With this, U-boot SPL knows it was loaded from MMC1 and use this info to
read full U-boot from MMC1 as well.

Cc: pprakash@ti.com
Cc: trini@ti.com
Signed-off-by: NJoel A Fernandes <joelagnel@ti.com>
Signed-off-by: NTom Rini <trini@ti.com>