ARM: dma-mapping: fix build break on no-MMU platform

ARM: dma-mapping: fix build break on no-MMU platform

This patch fixes the following build break on no-MMU ARM architectures:

arch/arm/mm/dma-mapping.c:576:39: error: macro "__alloc_from_pool" requires 4 arguments, but only 2 given
arch/arm/mm/dma-mapping.c: In function ‘__dma_alloc’:
arch/arm/mm/dma-mapping.c:576: error: ‘__alloc_from_pool’ undeclared (first use in this function)
arch/arm/mm/dma-mapping.c:576: error: (Each undeclared identifier is reported only once
arch/arm/mm/dma-mapping.c:576: error: for each function it appears in.)
make[1]: *** [arch/arm/mm/dma-mapping.o] Error 1

Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>