udebug: add mips specific quirk

udebug: add mips specific quirk

On some MIPS systems, mmap addresses need to be aligned to multiple pages, in
order to avoid issues with data cache aliases. Add an arch specific quirk to
allocate memory in 32 KiB chunks and align addresses returned by mmap.

Signed-off-by: Felix Fietkau <nbd@nbd.name>