arm: ti: boot: Don't read environment partition

This part should've been remove in commit 88d60db01168 ("arm: ti: boot:
Remove environment partition"), but I missed it somehow. Remove reading
dtb file from environment partition on eMMC, as we don't have it
anymore.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
1 file changed