powerpc: modules: skip r2 setup for ELFv2
powerpc: modules: skip r2 setup for ELFv2

ELFv2 doesn't need to set up r2 when calling a function.

Signed-off-by: Rusty Russell <df9728c9e5104131c08c7adb03af425394842596@rustcorp.com.au>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs