qcacld-3.0: Cleanup usage of RA rate limit variables in WMA

By design, when APF is supported by target, RA filtering need
not be configured. Legacy code handled this by passing INI value
of RA rate limit value to WMA and intersecting it with APF
enabled flag. Change Iabb75b46fce64b2c4a7a303848d7cb6b4714253b
replaced this implementation by a single check in PMO. So remove
the WMA legacy code since it has no purpose now. Also remove
unused PMO prototypes pmo_update_ra_limit and
pmo_update_target_service.

Cleaunp the WMA code that intersects RA rate limit and APF
variables.

Change-Id: I870a1271a627d47242000f5e04068e628f567216
CRs-Fixed: 2379745
6 files changed