arm: socfpga: DE0 use environment in common header
This removes the default environment from the de0 headers
and instead uses the common environment provided in
socfpga_common.h which now uses distro boot.
In addition to the above, add support to boot from the custom
a2 type partition
Signed-off-by: Dalon Westergreen <dwesterg@gmail.com> Acked-by: Marek Vasut <marex@denx.de>
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Changes in v2:
- Remove unneeded CONFIG_BOOTFILE