net: stmmac: Fix DMA typo

DAM is supposed to be DMA. Fix it to improve readability.
Signed-off-by: Andrew Halaney <ahalaney@redhat.com>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Brian Masney <bmasney@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/stmicro/stmmac/common.h

@@ -242,7 +242,7 @@ struct stmmac_safety_stats {
 
 #define SF_DMA_MODE 1		/* DMA STORE-AND-FORWARD Operation Mode */
 
-/* DAM HW feature register fields */
+/* DMA HW feature register fields */
 #define DMA_HW_FEAT_MIISEL	0x00000001	/* 10/100 Mbps Support */
 #define DMA_HW_FEAT_GMIISEL	0x00000002	/* 1000 Mbps Support */
 #define DMA_HW_FEAT_HDSEL	0x00000004	/* Half-Duplex Support */