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/cpu.c b/arch/mips/mach-mscc/cpu.c
index 4729b7a..1bfd636 100644
--- a/arch/mips/mach-mscc/cpu.c
+++ b/arch/mips/mach-mscc/cpu.c
@@ -91,7 +91,7 @@
 	writel(ICPU_SPI_MST_CFG_CS_DESELECT_TIME(0x19) +
 	       ICPU_SPI_MST_CFG_CLK_DIV(9), BASE_CFG + ICPU_SPI_MST_CFG);
 #endif
-#ifdef CONFIG_SOC_JR2
+#if defined(CONFIG_SOC_JR2) || defined(CONFIG_SOC_SERVALT)
 	writel(ICPU_SPI_MST_CFG_FAST_READ_ENA +
 	       ICPU_SPI_MST_CFG_CS_DESELECT_TIME(0x19) +
 	       ICPU_SPI_MST_CFG_CLK_DIV(14), BASE_CFG + ICPU_SPI_MST_CFG);