Qemu emulator requires at least 128MB of memory to boot on ppc64

The default nano and micro flavors need more memory to boot on
ppc64. New flavors are 128MB and 256MB, respectively.
Trailing spaces removed, again.

Change-Id: Ic6740bda959754380982e67f753876dc6d984685
Merge "Qemu emulator requires at least 128MB of memory to boot on ppc64"