scripts/tags.sh: Teach tags about some powerpc macros

The IO accessors on powerpc are generated using macro fu, ie. out_be32()
etc. Also there are some debugger related symbols that are macro
generated. Teach scripts/tags.sh about both.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michal Marek <mmarek@suse.com>