powerpc/85xx: Remove fsl,85... bindings

Since

  8a4ab218 ("powerpc/85xx: Change deprecated binding for 85xx-based boards")

those bindings are not used anymore.

A comment in drivers/edac/mpc85xx_edac.c say they are to be removed
with kernel 2.6.30.

Remove them now.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Scott Wood <oss@buserror.net>
Link: https://lore.kernel.org/r/82a8bc4450a4daee50ee5fada75621fecb3703ff.1648721299.git.christophe.leroy@csgroup.eu