powerpc: gamecube/wii: declare as non-coherent platforms
powerpc: gamecube/wii: declare as non-coherent platforms

The processors bundled in the Nintendo GameCube and Wii video game consoles
require explicit cache handling when DMA engines are used.

Signed-off-by: Albert Herranz <9ecb1621693c84d700c602998224d242238a1499@yahoo.es>
Signed-off-by: Grant Likely <9069e6f5a2b566e2674a0ba1e2bf39c12c195fad@secretlab.ca>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs