aarch32: Implement loadupdb instruction

Fill in aarch32 opcodes for loadupdb instruction, which is used
by various color space conversion programs. There is likely still
some space for optimization.
7 jobs for aarch64-loadupdb in 5 minutes and 54 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #5187184
android fedora arm64

00:05:53

passed #5187178
debian sid

00:00:39

passed #5187183
gst-ios-13.2
ios arm64

00:00:36

passed #5187182
gst-macos-10.15
macos x86_64

00:00:40

manual #5187181
gstreamer-windows 1809 windows docker allowed to fail manual
msys2
passed #5187179
gstreamer-windows 1809 windows docker
vs2017 amd64

00:00:40

passed #5187180
gstreamer-windows 1809 windows docker
vs2017 x86

00:00:39