Merge branch '2023-06-19-corstone1000-fwu-updates' into next

To quote the author:
Now that the nvmxip block driver is merged we can add on top
of it the platform code to use GPT and FWU metadata in the
Corstone1000.

But first, push 2 fixes that are needed to make all this work:
 - move nvmxip header to include
 - setup fwu metadata structures as packed (we have a 32bit
   writer - Secure enclave Cortex-M0 and a 64bit reader host
   Cortex-A35)