ARM: mxs: Enable MACH_APX4DEVKIT

Enable MACH_APX4DEVKIT to be built by default.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Lauri Hintsala <lauri.hintsala@bluegiga.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/configs/mxs_defconfig

@@ -28,6 +28,7 @@ CONFIG_MACH_MX28EVK=y
 CONFIG_MACH_STMP378X_DEVB=y
 CONFIG_MACH_TX28=y
 CONFIG_MACH_M28EVK=y
+CONFIG_MACH_APX4DEVKIT=y
 # CONFIG_ARM_THUMB is not set
 CONFIG_NO_HZ=y
 CONFIG_HIGH_RES_TIMERS=y