env: split fw_env.h in public and private parts

Move U-Boot private data into a separate file. This
lets export fw_env.h to be used by external programs
that want to change the environment using the

env: split fw_env.h in public and private parts

Move U-Boot private data into a separate file. This
lets export fw_env.h to be used by external programs
that want to change the environment using the library
built in tools/env.

Signed-off-by: Stefano Babic <sbabic@denx.de>

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