No toolchain we support should be generating stabs debug information
anymore. Drop the sections entirely from our linker scripts.

We removed all the manual stabs annotations in commit
12318163 ("powerpc/32: Remove remaining .stabs annotations").
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220928130951.1732983-1-mpe@ellerman.id.au