Collapse BNEP #defines that don't need to be configurable.

In some instances, defining these macros to FALSE would result in
broken runtime behavior (e.g. UUID fields containing uninitialized
values). This change collapses the following defines:

BNEP_SUPPORTS_PROT_FILTERS
BNEP_SUPPORTS_MULTI_FILTERS
BNEP_SUPPORTS_DEBUG_DUMP
BNEP_SUPPORTS_ALL_UUID_LENGTHS