manifest: groups: mips, x86 -> notdefault

We do not  not build any mips or x86 targets
ARM all the way!!

Change-Id: Ic6619f3a09e4a612f968e66d05966a3d76abb588
Signed-off-by: Arnav Gupta <championswimmer@aokp.co>
Merge "manifest: groups: mips, x86 -> notdefault" into jb-mr2