please cherry pick 75fea300d73a to 4.14.y

Hi Greg, Sasha, Would you please cherry pick commit 75fea300d73a ("ARM: 8723/2: always assume the "unified" syntax for assembly code") which first landed in v4.16-rc1 into 4.14.y?

In my experience, it cherry-picks cleanly. It fixes a stream of warnings we see when building 32b ARM kernels with Clang, like:

/tmp/signal-1ac549.s: Assembler messages: /tmp/signal-1ac549.s:76: conditional infixes are deprecated in unified syntax

We'll make immediate use of it in Android; if anyone objects to landing in stable let us know and we can carry it out of tree.