native/posix arch: Reorder sections to avoid a RWE segment

GNU ld since 2.39, produces more security related warnings.
Due to the way we ordered sections the linker may end up with
a segment in the elf which contains both executable code
and read and write data.
This results in this new versions of the linker warning us.

So, in the linker script,
let's move the executable native_sim_if section from
being placed with the other native port related segments
after .data to being placed after .text instead.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>