RE: [PATCH -mm] dma: INTEL_IOATDMA build fix

["Nelson, Shannon" <shannon.nelson@intel.com>]

Satyam Sharma [mailto:ssatyam@cse.iitk.ac.in] 
>
>Make CONFIG_INTEL_IOATDMA select CONFIG_DCA because it uses code
>exported from said dependency:
>
># CONFIG_DCA is not set
>CONFIG_INTEL_IOATDMA=m
>
>ERROR: "alloc_dca_provider" [drivers/dma/ioatdma.ko] undefined!
>ERROR: "register_dca_provider" [drivers/dma/ioatdma.ko] undefined!
>ERROR: "unregister_dca_provider" [drivers/dma/ioatdma.ko] undefined!
>ERROR: "free_dca_provider" [drivers/dma/ioatdma.ko] undefined!
>make[1]: *** [__modpost] Error 1
>
>"select" seems ok because CONFIG_DCA looks library-like and 
>doesn't itself
>depend upon anything else.
>
>Signed-off-by: Satyam Sharma <ssatyam@cse.iitk.ac.in>

Well, ioatdma should be smarter and not try to use ioat_dca.c if there
is no CONFIG_DCA.  However, until that happens, this is fine.

Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
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