Although the choice of CPU type currently only applies to Malta
flavours, there's nothing in these config files that prevents them
being used with other platforms (that we don't currently support).
kernelarch-mips/config.{4,5}kc-malta are exact duplicates of each other,
aside from the CPU type. Move all the common options out into
kernelarch-mips/config.malta.
Move mips/config.{4,5}kc-malta to kernelarch-mips where they belong,
adding '-r1' and '-r2' suffixes for the different CPU types.
- Enable it by default
- Disable it for armel/marvell since signature verification is not enabled.
- Disable it for mips and mipsel so linux-signed can be uploaded without
waiting for them to build
- Disable it for all architectures not in the main archive, as linux-signed
won't support them (at least, not initially).
We don't need a variable to control signing of the image, because
we should do that for all flavours that have CONFIG_EFI_STUB=y.