modpost: file2alias: go back to simple devtable lookup

Commit e49ce14 ("modpost: use linker section to generate table.")
was not so cool as we had expected first; it ended up with ugly section
hacks when commit dd2a3ac ("mod/file2alias: make modpost compile
on darwin again") came in.

Given a certain degree of unknowledge about the link stage of host
programs, I really want to see simple, stupid table lookup so that
this works in the same way regardless of the underlying executable
format.

Signed-off-by: Masahiro Yamada <[email protected]>
Acked-by: Mathieu Malaterre <[email protected]>

Author: masahir0y