[lldb] Re-enable GDB server client memory tag read tests

These were disabled in 473a3a77
because they failed on 32 bit platforms. (Arm for sure but I assume
any 32 bit)

This was due to the printf formatter used. These assumed
that types like uint64_t/size_t would be certain size/type and
that changes on 32 bit.

Instead use "z" to print the size_t and PRI<...> formatters
for the addr_t (always uint64_t) and the int32_t.