mips emit the following debug sections:
.mdebug* and .pdr

They were included in the check for non-allocatable section
and caused modpost to warn.

Manuel Lauss suggested to fix this by adding the relevant
sections to the list of sections we do not check.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Reported-by: NManuel Lauss <mano@roarinelk.homelinux.net>