Hack to make fw_setenv work

The fw_setenv is not working with the kernel mtd driver.  It works
on a plain flat file, and flashcp which is used in /update works.

Find the u-boot-env mtd, link it in run and copy the contents to a
plain file in /run during init.  In shutdown, check for the link,
the file having data, no current image update for the u-boot-env,
and that the content differs from the mtd via the link.  If all
are true create a symlink to the file and trigger the update.

Along wtih changing the fw_env.config this causes the fw_setenv
and fw_printenv utilities to set and update this cached file which
will be synced during a normal bmc reboot.  This will allow us to
set the ethaddr variable which already requires a reboot to activate.

Note: the links are directly in /run because the fw_{set,print}env
utilities limit the env file name to 16 characters.

Signed-off-by: Milton Miller <miltonmm@us.ibm.com>

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