main/mesa-pvr-dri-classic: remove

After merging, backport to v22.06. This is the only failing aarch64 package for v22.06.

main/mesa-pvr-dri-classic: remove

We decided against pvr hacks, quoting craftyguy from issue 1316:

> We discussed this in our team meeting, and ultimately decided that
> supporting pvr in pmaports/pmOS has many of the same problems that
> we saw when trying to support hallium/libhybris, something we
> decided against. For much of the same reasons, we've decided that we
> want to avoid adding the proprietary userspace components required to
> support pvr in pmOS.

No device port is using this package anymore, but we forgot to remove
it. After branching v22.06 I realized that it doesn't build anymore
and as stated in MR 2702, it's unmaintained.

Related: https://builds.sr.ht/~postmarketos/job/767700

non-free/sgx-ddk-um: remove

Only makes sense with mesa-pvr-dri-classic, which was dropped in the
previous commit. See the reasoning there.