dma: ti: k3-udma: Fix BCDMA probe by adding check for MMR_RFLOW

RFLOW config related MMR does not exist incase of BCDMA.
Add check to bypass the RFLOW MMR extraction.
Without this, the probe sequence fails checking for
the MMR_RFLOW region, which is valid only for packet based
DMA and obselete for BCDMA.

Fixes: 5abb694d ("dma: ti: k3-udma: Add support for native configuration of chan/flow")
Signed-off-by: Prasanth Babu Mantena <p-mantena@ti.com>
Tested-by: Jonathan Humphreys <j-humphreys@ti.com>

drivers/dma/ti/k3-udma.c

@@ -1331,6 +1331,8 @@ static int udma_get_mmrs(struct udevice *dev)
 			continue;
 		if (i == MMR_RCHANRT && ud->rchan_cnt == 0)
 			continue;
+		if (i == MMR_RFLOW && ud->match_data->type == DMA_TYPE_BCDMA)
+			continue;
 
 		ud->mmrs[i] = dev_read_addr_name_ptr(dev, mmr_names[i]);
 		if (!ud->mmrs[i])