Add support for the Freescale P1022DS. Driver support is limited to:
 - I2C
 - Ethernet
 - Serial
 - NOR flash
 - PIXIS FPGA

System clock configuration is read from the FPGA but has only been
tested using a 133MHz system clock and 100MHz DDR clock.

Boot arguments are defined in the environment to boot over NFS with
a console configured at 115200 bauds.

Enabling branch prediction is moved from board support to the platform
support for all boards as it is a CPU feature.

Some the code is from U-Boot version git-be937b5.

Signed-off-by: Renaud Barbier <renaud.barbier@ge.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>