i.MX2 family: Add basic mach support

This patch adds basic mach support for the mx2 processor family, based
on the original freescale code and adapted to mainline kernel coding
style.

This part adds the global build only.

Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de>

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index e72db27..009d4fe 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -137,6 +137,7 @@
  machine-$(CONFIG_ARCH_DAVINCI)	   := davinci
  machine-$(CONFIG_ARCH_KS8695)     := ks8695
   incdir-$(CONFIG_ARCH_MXC)	   := mxc
+ machine-$(CONFIG_ARCH_MX2)	   := mx2
  machine-$(CONFIG_ARCH_MX3)	   := mx3
  machine-$(CONFIG_ARCH_ORION5X)	   := orion5x
  machine-$(CONFIG_ARCH_MSM7X00A)   := msm