powerpc, 8xx: Move cache function into C files

Avoid unnecessary assembly functions when they can easily be written
in C.

Also remove dc_read() as it is nowhere referenced

Signed-off-by: Christoph

powerpc, 8xx: Move cache function into C files

Avoid unnecessary assembly functions when they can easily be written
in C.

Also remove dc_read() as it is nowhere referenced

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>

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