[ARM] arch/arm/kernel/dma-isa.c: named initializers

This patch converts struct dma_resources to named initializers.

Besides fixing a compile error in -mm, it didn't sound like a bad idea.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Acked-by: Alexander Schulz <alex@shark-linux.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>