[POWERPC] mpc5200: add Phytec pcm030 board support

Add board support for the Phytec pcm030 mpc5200b based board. It
does not need any platform specific fixups and as such is handled
as a mpc5200 simple platform.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>