[PATCH] ppc32: fix asm-ppc/dma-mapping.h sparse warning

GFP flags must be passed as unisgned int __nocast these days, else we'll
get tons of sparse warnings in every driver.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>