arm: ti: boot: Fix U-Boot environment partition address

arm: ti: boot: Fix U-Boot environment partition address

Recent removal of obsolete partition led to shifting of starting address
of "reserved" partition (which reflects U-Boot environment). Fix its
start address to keep it in sync with ENV_OFFSET and DFU environment.

This patch also provides fixed start address for "reserved" partition,
so that we can track when it's shifted next time.

While at it, move it before "misc" partition to keep all Android
partitions together.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Acked-By: Praneeth Bajjuri <praneeth@ti.com>