Xen extended regions should work correctly with z_mem_phys_addr and Z_MEM_PHYS_ADDR

[xakep-amatop]

We have to deal with Xen extended regions. The function z_mem_phys_addr and the macro Z_MEM_PHYS_ADDR aren't able to work with Xen extended regions. So, it can be used as for common cases.

I think that we need to add some code inside z_mem_phys_addr and Z_MEM_PHYS_ADDR, specifically changing the checks if we want to work with extended regions.

Note, in Linux, for example, Extended regions are implemented as hot-pluggable memory, so Linux mm subsystem can handle them correctly. So, probably we need to implement smth like this.

[xakep-amatop]

remove this WA after fixing the issue aosedge/aos_core_zephyr@4b04100