MSCC: Add support for Jaguar2 SOC family

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

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 5be8ff6..4729b7a 100644
--- a/arch/mips/mach-mscc/cpu.c
+++ b/arch/mips/mach-mscc/cpu.c
@@ -87,8 +87,15 @@
 	       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
 	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
+	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);
+#endif
 	/*
 	 * Legacy and mainline linux kernel expect that the
 	 * interruption map was set as it was done by redboot.