[POWERPC] Small cleanups to the cuboot bootwrapper code

This patch makes a few small cleanups to the cuboot code.
	- It removes the double layered selection of images, via
cuboot-plat-y, instead having the cuboot platforms directly select a
suitable image-y (this changes the name of the final cuboot image from
plain cuImage to cuImage.<platform>).
	- Factors out some code in the wrapper that's potentially
useful to platforms other than uboot.

Signed-off-by: David Gibson <[email protected]>
Acked-by: Scott Wood <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>

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