amd/common: lower bitfield_extract to ubfe/ibfe.

Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
10 jobs for !158 with bitfield in 25 minutes and 50 seconds (queued for 3 minutes and 19 seconds)
detached
Status Job ID Name Coverage
  Containers Build
passed #378656
debian

00:00:16

 
  Build+Test
passed #378658
meson-clang

00:09:03

passed #378662
meson-clover

00:11:03

passed #378661
meson-main

00:06:21

passed #378657
meson-swr-glvnd

00:06:22

passed #378663
meson-vulkan

00:01:36

passed #378665
scons-llvm

00:03:39

passed #378664
scons-nollvm

00:03:33

passed #378659
scons-swr

00:13:01

passed #378660
scons-win64

00:06:07