mx6: Add support for the mx6solox variant

mx6solox is the newest member of the mx6 family.

Some of the new features on this variants are:
- Cortex M4 microcontroller (besides the CortexA9)
- Dual Gigabit Ethernet

Add the initial support for it.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
diff --git a/arch/arm/include/asm/arch-imx/cpu.h b/arch/arm/include/asm/arch-imx/cpu.h
index a35940e..a3cc96f 100644
--- a/arch/arm/include/asm/arch-imx/cpu.h
+++ b/arch/arm/include/asm/arch-imx/cpu.h
@@ -8,6 +8,7 @@
 #define MXC_CPU_MX53		0x53
 #define MXC_CPU_MX6SL		0x60
 #define MXC_CPU_MX6DL		0x61
-#define MXC_CPU_MX6SOLO		0x62
+#define MXC_CPU_MX6SX		0x62
 #define MXC_CPU_MX6Q		0x63
 #define MXC_CPU_MX6D		0x64
+#define MXC_CPU_MX6SOLO		0x65 /* dummy ID */