dm: core: Round up size when allocating so that it is cache line aligned

The size variable may not be always be a mulitple of
ARCH_DMA_MINALIGN and using it to flush cache leads to cache
misaligned warnings.

Therefore, round up the size to a multiple of ARCH_DMA_MINLAIGN
when allocating private data.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/core/device.c b/drivers/core/device.c
index de63e53..9a46a7b 100644
--- a/drivers/core/device.c
+++ b/drivers/core/device.c
@@ -254,6 +254,7 @@
 	void *priv;
 
 	if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
+		size = ROUND(size, ARCH_DMA_MINALIGN);
 		priv = memalign(ARCH_DMA_MINALIGN, size);
 		if (priv) {
 			memset(priv, '\0', size);