dma-direct: Temporary DMA fix on arm64

See: #3251

Signed-off-by: Phil Elwell <[email protected]>

Author: Phil Elwell

kernel/dma/direct.c

@@ -397,7 +397,7 @@ int dma_direct_supported(struct device *dev, u64 mask)
 	if (IS_ENABLED(CONFIG_ZONE_DMA))
 		min_mask = DMA_BIT_MASK(ARCH_ZONE_DMA_BITS);
 	else
-		min_mask = DMA_BIT_MASK(32);
+		min_mask = DMA_BIT_MASK(30);
 
 	min_mask = min_t(u64, min_mask, (max_pfn - 1) << PAGE_SHIFT);