lima/ppir: lower ffma in ppir

Since we cannot handle ffma in ppir, lower it on nir level already.

Signed-off-by: Andreas Baierl <ichgeh@imkreisrum.de>
Reviewed-by: Qiang Yu <yuq825@gmail.com>
10 jobs for !1112 with ffma in 9 minutes and 59 seconds (queued for 3 seconds)
detached
Status Job ID Name Coverage
  Containers Build
passed #377715
debian

00:00:22

 
  Build+Test
passed #377717
meson-clang

00:09:24

passed #377721
meson-clover

00:09:36

passed #377720
meson-main

00:05:51

passed #377716
meson-swr-glvnd

00:06:17

passed #377722
meson-vulkan

00:02:48

passed #377724
scons-llvm

00:04:28

passed #377723
scons-nollvm

00:03:54

passed #377718
scons-swr

00:06:01

passed #377719
scons-win64

00:07:19