After moving SOC_IMX51 support over to device tree, all i.MX5 support
becomes device tree only now.  So options SOC_IMX5 and SOC_IMX51 can
just be under 'Device tree only'.
While at it, 'select ARCH_MXC_IOMUX_V3' is dropped, since it's only
needed by non-DT build before.
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
        select PINCTRL_IMX35
        select SMP_ON_UP if SMP
 
-config SOC_IMX5
-       bool
-       select ARCH_HAS_OPP
-       select ARCH_MXC_IOMUX_V3
-       select HAVE_IMX_SRC
-       select MXC_TZIC
-
-config SOC_IMX51
-       bool
-       select PINCTRL_IMX51
-       select SOC_IMX5
-
 if ARCH_MULTI_V4T
 
 comment "MX1 platforms:"
 
 comment "Device tree only"
 
+config SOC_IMX5
+       bool
+       select ARCH_HAS_OPP
+       select HAVE_IMX_SRC
+       select MXC_TZIC
+
+config SOC_IMX51
+       bool
+       select PINCTRL_IMX51
+       select SOC_IMX5
+
 config SOC_IMX50
        bool "i.MX50 support"
        select PINCTRL_IMX50