c6x: convert fdt pointers to opaque pointers
c6x: convert fdt pointers to opaque pointers

The architecture code does not need to access the internals of the FDT
blob, so make the pointer to it void *.

Signed-off-by: Rob Herring <fbb37eacae100e13076d5c4b46f06cfa4d6fa9f8@kernel.org>
Cc: Mark Salter <3186038803479a476d7152f26680d7b1b21c12c4@redhat.com>
Cc: Aurelien Jacquiot <dcf0ec6b8bf48e89879519600bba5b186688818d@ti.com>
Cc: d91e205a58c905a3a8d120934369aae68eb61e1f@linux-c6x.org
Tested-by: Grant Likely <9069e6f5a2b566e2674a0ba1e2bf39c12c195fad@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs