ARM: mach-prima2: move ARM_DMA_ZONE_SIZE to mdesc->dma_zone_size

Original comment:

  Restrict DMA-able region to workaround silicon limitation.
  The limitation restricts buffers available for DMA to SD/MMC
  hardware to be below 256MB.
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>

arch/arm/mach-prima2/include/mach/memory.h

@@ -11,11 +11,4 @@
 
 #define PLAT_PHYS_OFFSET        UL(0x00000000)
 
-/*
- * Restrict DMA-able region to workaround silicon limitation.
- * The limitation restricts buffers available for DMA to SD/MMC
- * hardware to be below 256MB
- */
-#define ARM_DMA_ZONE_SIZE	(SZ_256M)
-
 #endif

arch/arm/mach-prima2/prima2.c

@@ -36,6 +36,7 @@ MACHINE_START(PRIMA2_EVB, "prima2cb")
 	.map_io         = sirfsoc_map_lluart,
 	.init_irq	= sirfsoc_of_irq_init,
 	.timer		= &sirfsoc_timer,
+	.dma_zone_size	= SZ_256M,
 	.init_machine	= sirfsoc_mach_init,
 	.dt_compat      = prima2cb_dt_match,
 MACHINE_END