[PowerPC][NFC] Rename ANDI(S)o8 to ANDI(S)8o

Summary:
This is found during https://reviews.llvm.org/D70758
All the other record forms are having suffix o at the end.
ANDIo8 and ANDISo8 are the only two that put o before 8.

This patch rename them to be consistent with others.

Reviewers: #powerpc, hfinkel, nemanjai, lei, steven.zhang, echristo, jhibbits, joerg

Reviewed By: jhibbits

Subscribers: wuzish, hiraditya, kbarton, shchenz, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70928