MSCC: Add support for Serval SoC family.

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

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/arch/mips/mach-mscc/cpu.c b/arch/mips/mach-mscc/cpu.c
index 1bfd636..ac75d51 100644
--- a/arch/mips/mach-mscc/cpu.c
+++ b/arch/mips/mach-mscc/cpu.c
@@ -87,7 +87,7 @@
 	       ICPU_SPI_MST_CFG_CS_DESELECT_TIME(0x19) +
 	       ICPU_SPI_MST_CFG_CLK_DIV(9), BASE_CFG + ICPU_SPI_MST_CFG);
 #else
-#ifdef CONFIG_SOC_OCELOT
+#if defined(CONFIG_SOC_OCELOT) || defined(CONFIG_SOC_SERVAL)
 	writel(ICPU_SPI_MST_CFG_CS_DESELECT_TIME(0x19) +
 	       ICPU_SPI_MST_CFG_CLK_DIV(9), BASE_CFG + ICPU_SPI_MST_CFG);
 #endif