MSCC: Add support for Servalt SoC family.

As Ocelot, Luton and Jaguar2, this family of SoCs are found
in Microsemi Switches solution.

Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
diff --git a/arch/mips/mach-mscc/dram.c b/arch/mips/mach-mscc/dram.c
index 8002e07..2073821 100644
--- a/arch/mips/mach-mscc/dram.c
+++ b/arch/mips/mach-mscc/dram.c
@@ -19,7 +19,8 @@
 
 	ret = hal_vcoreiii_train_bytelane(0);
 
-#if defined(CONFIG_SOC_OCELOT) || defined(CONFIG_SOC_JR2)
+#if defined(CONFIG_SOC_OCELOT) || defined(CONFIG_SOC_JR2) || \
+	defined(CONFIG_SOC_SERVALT)
 	if (ret)
 		return ret;
 	ret = hal_vcoreiii_train_bytelane(1);