da850/omap-l138: davinci_emac: Suppress auto negotiation if needed

negotiation is enabled in RMII mode. Some boards based on da850 need
to suppress this procedure.

CC: Rajashekhara, Sudhakar <sudhakar.raj@ti.com>
CC: Lad, Prabhakar <prabhakar.lad@ti.com>
CC: Hadli, Manjunath <manjunath.hadli@ti.com>
CC: sbabic@denx.de
Acked-by: Stefano Babic <sbabic@denx.de>
CC: Tom Rini <trini@ti.com>
Signed-off-by: Bastian Ruppert <Bastian.Ruppert@Sewerin.de>
Acked-by: Prabhakar Lad <prabhakar.lad@ti.com>

drivers/net/davinci_emac.c

@@ -897,7 +897,8 @@ int davinci_emac_initialize(void)
 	}
 
 #if defined(CONFIG_DRIVER_TI_EMAC_USE_RMII) && \
-		defined(CONFIG_MACH_DAVINCI_DA850_EVM)
+		defined(CONFIG_MACH_DAVINCI_DA850_EVM) && \
+			!defined(CONFIG_DRIVER_TI_EMAC_RMII_NO_NEGOTIATE)
 	for (i = 0; i < num_phy; i++) {
 		if (phy[i].is_phy_connected(i))
 			phy[i].auto_negotiate(i);