powerpc/fsl_soc: isolate legacy fsl_spi support to mpc832x_rdb boards
The advantages of this: - Don't encourage legacy support; - Less external symbols, less code to compile-in for !MPC832x_RDB platforms. Signed-off-by: NAnton Vorontsov <avorontsov@ru.mvista.com> Cc: David Brownell <david-b@pacbell.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Kumar Gala <galak@gate.crashing.org> Cc: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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