net: stmmac: make some functions static

The functions dwmac4_dma_init_rx_chan, dwmac4_dma_init_tx_chan and
dwmac4_dma_init_channel do not need to be in global scope, so them
static.

Cleans up sparse warnings:
"symbol 'dwmac4_dma_init_rx_chan' was not declared. Should it be static?"
"symbol 'dwmac4_dma_init_tx_chan' was not declared. Should it be static?"
"symbol 'dwmac4_dma_init_channel' was not declared. Should it be static?"
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c

@@ -71,9 +71,9 @@ static void dwmac4_dma_axi(void __iomem *ioaddr, struct stmmac_axi *axi)
 	writel(value, ioaddr + DMA_SYS_BUS_MODE);
 }
 
-void dwmac4_dma_init_rx_chan(void __iomem *ioaddr,
-			     struct stmmac_dma_cfg *dma_cfg,
-			     u32 dma_rx_phy, u32 chan)
+static void dwmac4_dma_init_rx_chan(void __iomem *ioaddr,
+				    struct stmmac_dma_cfg *dma_cfg,
+				    u32 dma_rx_phy, u32 chan)
 {
 	u32 value;
 	u32 rxpbl = dma_cfg->rxpbl ?: dma_cfg->pbl;
@@ -85,9 +85,9 @@ void dwmac4_dma_init_rx_chan(void __iomem *ioaddr,
 	writel(dma_rx_phy, ioaddr + DMA_CHAN_RX_BASE_ADDR(chan));
 }
 
-void dwmac4_dma_init_tx_chan(void __iomem *ioaddr,
-			     struct stmmac_dma_cfg *dma_cfg,
-			     u32 dma_tx_phy, u32 chan)
+static void dwmac4_dma_init_tx_chan(void __iomem *ioaddr,
+				    struct stmmac_dma_cfg *dma_cfg,
+				    u32 dma_tx_phy, u32 chan)
 {
 	u32 value;
 	u32 txpbl = dma_cfg->txpbl ?: dma_cfg->pbl;
@@ -99,8 +99,8 @@ void dwmac4_dma_init_tx_chan(void __iomem *ioaddr,
 	writel(dma_tx_phy, ioaddr + DMA_CHAN_TX_BASE_ADDR(chan));
 }
 
-void dwmac4_dma_init_channel(void __iomem *ioaddr,
-			     struct stmmac_dma_cfg *dma_cfg, u32 chan)
+static void dwmac4_dma_init_channel(void __iomem *ioaddr,
+				    struct stmmac_dma_cfg *dma_cfg, u32 chan)
 {
 	u32 value;