ARM: imx: prepare deprecating ARCH_MX1, MACH_MX2, MACH_MX21 and MACH_MX27

MACH_... is reserved for machine support, so use SOC as prefix, not MACH.

This introduces new symbols SOC_IMX1, SOC_IMX21 and SOC_IMX27.  They are
selected by the old symbols for now.  There is no substitute for MACH_MX2
as most usages of MX2 only means MX21 + MX27 but not MX25.

Later the choice about CPU and CPU family should go away and the individual
machines should select the right SOC symbol.  This is a precondition to
support more than one SOC in a single kernel image.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

arch/arm/mach-imx/Kconfig

 if ARCH_MX1
 
+config SOC_IMX1
+	select CPU_ARM920T
+	select IMX_HAVE_IOMUX_V1
+	bool
+
 comment "MX1 platforms:"
 config MACH_MXLADS
 	bool
@@ -19,19 +24,31 @@ endif
 
 if ARCH_MX2
 
+config SOC_IMX21
+	select CPU_ARM926T
+	select ARCH_MXC_AUDMUX_V1
+	select IMX_HAVE_IOMUX_V1
+	bool
+
+config SOC_IMX27
+	select CPU_ARM926T
+	select ARCH_MXC_AUDMUX_V1
+	select IMX_HAVE_IOMUX_V1
+	bool
+
 choice
 	prompt "CPUs:"
 	default MACH_MX21
 
 config MACH_MX21
 	bool "i.MX21 support"
-	select ARCH_MXC_AUDMUX_V1
+	select SOC_IMX21
 	help
 	  This enables support for Freescale's MX2 based i.MX21 processor.
 
 config MACH_MX27
 	bool "i.MX27 support"
-	select ARCH_MXC_AUDMUX_V1
+	select SOC_IMX27
 	help
 	  This enables support for Freescale's MX2 based i.MX27 processor.
 

arch/arm/plat-mxc/Kconfig

@@ -8,15 +8,12 @@ choice
 
 config ARCH_MX1
 	bool "MX1-based"
-	select CPU_ARM920T
-	select IMX_HAVE_IOMUX_V1
+	select SOC_IMX1
 	help
 	  This enables support for systems based on the Freescale i.MX1 family
 
 config ARCH_MX2
 	bool "MX2-based"
-	select CPU_ARM926T
-	select IMX_HAVE_IOMUX_V1
 	help
 	  This enables support for systems based on the Freescale i.MX2 family