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 debian #377715

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  Build+Test
passed meson-clang #377717

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passed meson-clover #377721

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passed meson-main #377720

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passed meson-swr-glvnd #377716

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passed meson-vulkan #377722

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passed scons-llvm #377724

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passed scons-nollvm #377723

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passed scons-swr #377718

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passed scons-win64 #377719

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