powerpc/mm: Eliminate not possible mmu features at compile time
Depending on the CONFIG selected, many of the MMU features are not possible. Lets only get the possible ones in MMU_FTRS_POSSIBLE. This allows gcc to get rid at compile time of code related to not possible features. Signed-off-by: NChristophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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