ARM: vf610: Initial integration for Colibri VF50/VF61

This adds initial support for Colibri VF50/VF61 based on Freescale
Vybrid SoC.

- CPU clocked at 396/500 MHz
- DDR3 at 396MHz
  - for VF50, use PLL2 as memory clock (synchronous mode)
  - for VF61, use PLL1 as memory clock (asynchronous mode)
- Console on UART0 (Colibri UART_A)
- Ethernet on FEC1
- PLL5 based RMII clocking (E.g. No external crystal)
- UART_A and UART_C I/O muxing
- Boot from NAND by default

Tested on Colibri VF50/VF61 booting using serial loader over UART.

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
Acked-by: Stefan Agner <stefan@agner.ch>
diff --git a/configs/colibri_vf_defconfig b/configs/colibri_vf_defconfig
new file mode 100644
index 0000000..cef5a9e
--- /dev/null
+++ b/configs/colibri_vf_defconfig
@@ -0,0 +1,3 @@
+CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/toradex/colibri_vf/imximage.cfg,ENV_IS_IN_NAND,IMX_NAND"
+CONFIG_ARM=y
+CONFIG_TARGET_COLIBRI_VF=y