powerpc/8xxx: Fix LAW init to respect pre-initialized entries
If some pre-boot or earlier stage bootloader (NAND SPL) has setup LAW
entries consider them good and mark them used.
In the NAND SPL case we skip re-initializing based on the law_table
since the SPL phase already did that.
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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